CN110262102B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN110262102B CN110262102B CN201910362638.2A CN201910362638A CN110262102B CN 110262102 B CN110262102 B CN 110262102B CN 201910362638 A CN201910362638 A CN 201910362638A CN 110262102 B CN110262102 B CN 110262102B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133512—Light shielding layers, e.g. black matrix
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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
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optics & Photonics (AREA)
- Human Computer Interaction (AREA)
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- Theoretical Computer Science (AREA)
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Abstract
The invention discloses a display panel and a display device, wherein the display panel comprises a color film substrate and an array substrate which are oppositely arranged, and one side of the array substrate close to the color film substrate is provided with a plurality of light-sensitive elements; the display panel further comprises an alignment hole unit, wherein the alignment hole unit penetrates through the color film substrate and part of the film layers of the array substrate in a first direction, the alignment hole unit corresponds to the light sensing elements one by one, and the first direction is perpendicular to the display panel; the collimating hole unit comprises a central part and a shading part, and the orthographic projection of the shading part on the color film substrate surrounds the orthographic projection of the central part on the color film substrate; the light shielding portion includes a plurality of light shielding layers in the first direction, and blocks light from entering the central portion from gaps between the plurality of light shielding layers. The invention has no reflected light entering the central part through the opening area, so the light reaching the light sensing element is only one fingerprint valley or fingerprint ridge, no interference is caused, and the fingerprint identification precision is improved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel and a display device.
Background
With the popularization of mobile display products, information security is receiving much attention from people. A fingerprint is a permanent feature unique to the human body and distinguishable from others, and is composed of a series of ridges and valleys on the surface of the skin at the finger tip, the details of which typically include the branches of the ridges, the ends of the ridges, the arches, the tent arches, the left-handed, right-handed, spiral, or double-handed details, which determine the uniqueness of the fingerprint pattern. Because the fingerprint has the advantages of uniqueness, difficult copying, safety and the like, in recent years, the fingerprint identification technology is widely applied to mobile display products as a mode of identity authentication and access control, so that the safety and the easy operability of the mobile display products are greatly improved.
Light fingerprint identification is the refraction and the reflection principle of utilizing light, puts the finger on the light lens, through the reflection difference of light at finger surface valley and ridge, realizes that induction element receives different fingerprint information differentiation, forms the fingerprint image, and the theory of operation is fairly simple, is fit for removing the comprehensive screen design of showing the product, nevertheless because the used induction element receives the influence of optical noise easily at the fingerprint identification in-process for fingerprint identification's precision is difficult to improve.
Therefore, in order to realize the comprehensive screen of the mobile display product, how to improve the accuracy of light fingerprint identification is a technical problem to be solved urgently in the field.
Disclosure of Invention
The present invention provides a display panel and a display device for improving the accuracy of light fingerprint identification.
On one hand, the invention provides a display panel, which comprises a color film substrate and an array substrate which are oppositely arranged, wherein a plurality of light sensing elements are arranged on one side of the array substrate, which is close to the color film substrate;
the display panel further comprises an alignment hole unit, the alignment hole unit penetrates through the color film substrate and part of the film layers of the array substrate in a first direction, the alignment hole unit and the light sensing elements are in one-to-one correspondence, and the first direction is perpendicular to the display panel;
the collimating hole unit comprises a central part and a shading part, and the orthographic projection of the shading part on the color film substrate surrounds the orthographic projection of the central part on the color film substrate;
the light shielding portion includes a plurality of light shielding layers in the first direction, and blocks light from entering the central portion from gaps between the plurality of light shielding layers.
In another aspect, the invention further provides a display device comprising the display panel.
Compared with the prior art, the display panel and the display device provided by the invention at least realize the following beneficial effects:
the display panel provided by the invention comprises an alignment hole unit, wherein the alignment hole unit penetrates through the color film substrate and part of film layers of the array substrate in a first direction, and the alignment hole unit corresponds to the light sensing elements one by one; the collimating hole unit comprises a central part and a shading part, and the orthographic projection of the shading part on the color film substrate surrounds the orthographic projection of the central part on the color film substrate; the shading part comprises a plurality of shading layers in the first direction, light is blocked from entering the central part from gaps among the shading layers, and non-reflected light enters the central part through the opening area, so that the light reaching the light sensing element is only a fingerprint valley or a fingerprint ridge, interference is avoided, and the fingerprint identification precision is improved.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic structural diagram of a display module provided in the prior art;
FIG. 2 is a schematic plan view of a display panel according to the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 5 is a schematic view of one of the shading principles of FIG. 4;
FIG. 6 is a schematic view of another shading principle in FIG. 4;
FIG. 7 is a sectional view taken along line A-A of FIG. 2;
FIG. 8 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 9 is a sectional view taken along line A-A of FIG. 2;
FIG. 10 is a schematic plan view of a display panel according to another embodiment of the present invention;
FIG. 11 is a schematic plan view of a display panel according to another embodiment of the present invention;
fig. 12 is a schematic structural diagram of a display device according to the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a display module provided in the prior art. As shown in fig. 1, a display module 00 includes a display panel 01 and a backlight module 02 which are oppositely disposed, and further includes a glass cover plate 03 disposed on a light emitting surface of the display panel 01, the display panel 01 includes a color film substrate 001 and an array substrate 002 which are oppositely disposed, and a liquid crystal layer 003 located between the color film substrate 001 and the array substrate 002, liquid crystal molecules are in the liquid crystal layer 003, a fingerprint identification unit 04 is disposed on the array substrate 002, of course, the display panel 01 further includes an upper polarizer 004 located on the color film substrate 001 away from the backlight module 02, and a lower polarizer 005 located on the array substrate 002 and close to the backlight module 02. The working principle of the fingerprint identification unit 04 is as follows: when a finger touches the display screen, the light source reflects when irradiating the valley line and the ridge line of the finger fingerprint, because the reflection angles of the valley line and the ridge line and the reflected illumination intensity are different, the light is projected onto the fingerprint identification unit 04, and the fingerprint identification unit 04 transmits the received sensing signal to the fingerprint identification signal receiving unit (not shown in the figure) through the fingerprint signal line, so that the fingerprint identification signal receiving unit identifies the valley line and the ridge line of the fingerprint according to the received signal. When the finger 007 contacts the glass cover plate 03, a series of fingerprint ridges 008 and fingerprint valleys 009 on the skin surface of the finger end constitute a fingerprint, light emitted by the light source reaches the finger after passing through the liquid crystal layer 003, the color film substrate 001, the upper polarizer 004 and the glass cover plate 03, and then reaches the fingerprint identification unit 04 on the array substrate 002 after being reflected and sequentially passing through the glass cover plate 03, the upper polarizer 004, the color film substrate 001 and the liquid crystal layer 003.
Since a retaining wall cannot be formed in a liquid crystal display panel to resist the path of the reflected light to reach the fingerprint recognition unit 04 in the prior art, the collimating hole unit 06 is provided in fig. 1, for example, the collimating hole unit 06 is provided in fig. 1, the collimating hole unit 06 includes a central portion 061 and a shading portion 062, the orthographic projection of the shading portion 062 on the color filter substrate 001 surrounds the orthographic projection of the central portion 061 on the color filter substrate 001, and the shading portion 062 includes a plurality of shading layers 063, but because the distance between adjacent shading layers 063 is unreasonable, for example, the distance between adjacent shading layers 063 in the first direction X is large, there is a phenomenon of light leakage, the light L1 enters the central portion 061 from between the shading layers 063, and the light finally reaching the fingerprint recognition unit 04 has L1 in addition to L2, which causes interference, and the fingerprint recognition unit 04 cannot recognize whether the ridge is the light reflected by the fingerprint valley, the fingerprint identification precision is reduced; if the number of the light shielding layers 063 is infinitely increased to prevent light leakage, the manufacturing cost is undoubtedly increased, and the process warpage and precision bottlenecks exist.
In order to solve the above technical problems, the present invention provides a display panel and a display device. Embodiments of the display panel and the display device provided by the present invention will be described in detail below.
Referring to fig. 2 and 3, fig. 2 is a schematic plan view of a display panel according to the present invention; fig. 3 is a sectional view taken along line a-a in fig. 2. Fig. 3 includes a color film substrate 1 and an array substrate 2 which are oppositely arranged, and a plurality of light sensing elements 30 are arranged on one side of the array substrate 2 close to the color film substrate 1; the display panel further comprises a collimating hole unit 5, the collimating hole unit 5 penetrates through partial film layers of the color film substrate 1 and the array substrate 2 in a first direction X, the collimating hole unit 5 corresponds to the light sensing elements 30 one by one, and the first direction X is perpendicular to the display panel. Here, the part of the film layers of the color filter substrate 1 and the array substrate 2 penetrated by the collimating hole unit 5 in the first direction X refers to an optical channel path formed by the light reflected by the fingerprint ridges or fingerprint valleys passing through the color filter substrate 1 and the part of the film layers of the array substrate 2.
In fig. 2 and 3, the collimating hole unit 5 includes a central portion 51 and a light shielding portion 52, and an orthographic projection of the light shielding portion 52 on the color filter substrate 1 surrounds an orthographic projection of the central portion on the color filter substrate 1;
the light shielding portion 52 includes a plurality of light shielding layers 53 in the first direction X in fig. 3, and blocks light from entering the central portion 51 from gaps between the plurality of light shielding layers 53. The OA in FIG. 3 is an opening area, and the display panel is displayed in the opening area OA.
In fig. 2, the display panel 100 includes a pixel 4, the pixel 4 includes sub-pixels, and optionally at least R, G, B color sub-pixels, and in fig. 3, a liquid crystal layer 3 is further interposed between the color film substrate 1 and the array substrate 2, but it is understood that the display panel 100 further includes an upper polarizer located on the color film substrate 1 and departing from the array substrate 2, a lower polarizer located on the array substrate 2 and departing from the color film substrate 1, and a glass cover plate (not shown in the drawing) located on a light-emitting surface of the display panel 100. In addition, the size of the array substrate 2 may be larger than that of the color filter substrate 1, so that a step region (not shown) is easily formed between the two, and is used to bind devices such as an integrated circuit chip and the like providing various driving signals for the array substrate 2, and the color filter substrate 1 and the array substrate 2 both include substrate substrates, and the substrate substrates may be made of glass.
The shapes of the central portion 51 and the light shielding portion 52 are not particularly limited, and may be circular, or may be other shapes, and are illustrated as circular in fig. 2.
The display panel provided by the invention at least has the following technical effects:
since the plurality of light shielding layers 53 are disposed in the first direction X, and light is blocked from entering the central portion 51 from the gaps between the plurality of light shielding layers 53, and no reflected light enters the central portion 51 through the opening area OA, the light reaching the light sensing element 30 is only one fingerprint valley or fingerprint ridge, and interference is not caused, and the accuracy of fingerprint identification is improved.
Referring to fig. 4, fig. 4 is a cross-sectional view taken along a line a-a of fig. 2. Fig. 4 includes a color film substrate 1 and an array substrate 2 which are oppositely arranged, and a plurality of light sensing elements 30 are arranged on one side of the array substrate 2 close to the color film substrate 1; the display panel further comprises a collimating hole unit 5, the collimating hole unit 5 penetrates through partial film layers of the color film substrate 1 and the array substrate 2 in a first direction X, the collimating hole unit 5 corresponds to the light sensing elements 30 one by one, and the first direction X is perpendicular to the display panel. The collimating hole unit 5 includes a central portion 51 and a light shielding portion 52, and an orthographic projection of the light shielding portion 52 on the color filter substrate 1 surrounds an orthographic projection of the central portion on the color filter substrate 1. The light shielding portion 52 includes a plurality of light shielding layers 53 in the first direction X, and blocks light from entering the central portion 51 from gaps between the plurality of light shielding layers 53.
In fig. 4, the plurality of light-shielding layers 53 include a first light-shielding layer 531, a second light-shielding layer 532 …, an i-2 light-shielding layer 533, an i-1 light-shielding layer 534, an i-1 light-shielding layer 535, and a top light-shielding layer 536, and the first light-shielding layer 531, the second light-shielding layer 532 …, the i-2 light-shielding layer 533, the i-1 light-shielding layer 534, the i-2 light-shielding layer 535, and the top light-shielding layer 536 are gradually away from the plane where the light sensing element 30 is located in the first direction X. Of course, other light-shielding layers may be included as long as light is sufficiently blocked from entering the central portion 51 from the gaps between the plurality of light-shielding layers 53.
The color film substrate 1 comprises a black matrix BM, and the ith light shielding layer 535 and the black matrix BM are arranged in the same layer; the top light-shielding layer 536 is located on a side of the black matrix BM away from the array substrate 2, where i is a positive integer greater than 2.
It is understood that the top light-shielding layer determines the area of the light spot that can be recognized by the light-sensing element, i.e., determines the amount of light entering the center portion. When the value of i is 3, the plurality of light-shielding layers 53 include a first light-shielding layer (corresponding to the i-2 th light-shielding layer), a second light-shielding layer (corresponding to the i-1 th light-shielding layer), a third light-shielding layer (corresponding to the i-th light-shielding layer), and a top light-shielding layer, and when the value of i is 5, the plurality of light-shielding layers 53 include a first light-shielding layer, a second light-shielding layer, a third light-shielding layer (corresponding to the i-2 th light-shielding layer), a fourth light-shielding layer (corresponding to the i-1 th light-shielding layer), a fifth light-shielding layer (corresponding to the i-th light-shielding layer), and a top light-shielding layer, and therefore the value of i is variable.
Since the first light-shielding layer 531, the second light-shielding layer 532 …, the i-2 light-shielding layer 533, the i-1 light-shielding layer 534, the i light-shielding layer 535, and the top light-shielding layer 536 are provided in the first direction X, and light can be blocked from entering the central portion 51 from the gaps between the plurality of light-shielding layers 53, and non-reflected light enters the central portion 51 through the opening area OA, the light reaching the light-sensing element 30 is only one fingerprint valley or fingerprint ridge, and interference is not caused, and the accuracy of fingerprint identification is improved.
With reference to fig. 4 and fig. 5, fig. 5 is a schematic diagram of a light shielding principle in fig. 4, where a distance between two adjacent collimating aperture units 5 in the second direction Y is n, and a width of the first light shielding layer 531 in the second direction Y is m1The distance between the first light shielding layer 531 and the plane of the light sensing element 30 in the first direction X is 0; the distance between the second light-shielding layer 532 and the plane of the first light-shielding layer 531 in the first direction x is h1(ii) a The distance from the ith light-shielding layer 535 to the plane of the light-sensing element 30 is a; the distance from the i-1 th light-shielding layer 534 to the plane of the light-sensing element 30 is g, wherein,
the second direction Y intersects the first direction X.
The distance n between two adjacent collimating hole units 5 in the present invention refers to the distance between the outer edges of the collimating hole units 5, and it can be understood that an opening area OA is between the collimating hole units 5; it should be noted that the width of the light shielding layer 53 in the second direction Y in the present invention refers to the distance between the outer edge of the light shielding layer 53 and the central portion 51, and as the light shielding layer 53 is annular, the width of the light shielding layer 53 refers to the distance from the outer ring to the inner ring.
Here, the distance from the side of the first light shielding layer 531 close to the light sensing element 30 to the plane of the light sensing element 30 is 0.
In fig. 4, the light enters from between the first light-shielding layer 531 and the second light-shielding layer 532 to the right sideThe light in the straight hole unit 5 is a critical value, and the extension line of the straight line BE can determine the distance g from the i-1 th light-shielding layer 534 to the plane of the light-sensing element 30 according to the principle that two points determine a straight line. That is, the light passing from the upper edges of the i-th light-shielding layer 535 and the i-1 th light-shielding layer 534 of the left collimating hole unit 5 enters into the right collimating hole unit 5 from between the first light-shielding layer 531 and the second light-shielding layer 532 according to the triangle-like principle, as shown in FIG. 5, Δ ABC- Δ DBE, thereby
When the distance g between the i-1 th light shielding layer 534 and the plane of the light sensing element 30 is equal to or less than the distance a between the i light shielding layer 535 and the plane of the light sensing element 30, no light enters the center portion 51 of the collimating aperture unit 5 from between the first light shielding layer 531 and the second light shielding layer 532.
Since the first light-shielding layer 531, the second light-shielding layer 532 …, the i-2 light-shielding layer 533, the i-1 light-shielding layer 534, the i-1 light-shielding layer 535, and the top light-shielding layer 536 are provided in the first direction X, and the distance from the i-1 light-shielding layer 534 to the plane of the light-sensing element 30 is g,
no light enters the center 51 of the collimating aperture unit 5 from between the first light shielding layer 531 and the second light shielding layer 532, so that the light reaching the light sensing element 30 is only one fingerprint valley or fingerprint ridge, which does not cause interference, and improves the accuracy of fingerprint identification.
Referring to fig. 4 and 6, fig. 6 is a schematic view of another light shielding principle in fig. 4. The inner diameter of the central portion 51 of FIG. 4 is d; the distances between the adjacent light-shielding layers are h from the second light-shielding layer 532 to the ith light-shielding layer 5352、h3…hi-2、hi-1The second light-shielding layer 532 … has the i-2 th light-shielding layer 533, the i-1 th light-shielding layer 534, and the i-th light-shielding layer 535 each having a width m in the second direction Y2、…mi-2、mi-1、mi(ii) a Wherein
Here, the inner diameter is d when the central portion 51 is circular, and the inner diameter refers to the width of the central portion 51 in the second direction Y when the central portion 51 is in another shape.
FIG. 6 is a schematic diagram illustrating a schematic diagram of blocking light from entering the central portion between the light-shielding layers in the same collimating aperture unit, as shown in FIG. 4, light from the light-shielding layer 53 on the left side in the cross-sectional view of the collimating aperture unit 5 enters the central portion 51, FIG. 4 illustrates two light critical values entering the central portion 51 from below the i-2 th light-shielding layer 533 and from between the i-2 th light-shielding layer 533 and the i-1 th light-shielding layer 534, and when the distance between the i-2 th light-shielding layer 533 and the lower light-shielding layer in the second direction Y is equal to or smaller than h3And h is equal to or smaller than the distance between the i-2 light-shielding layer 533 and the i-1 light-shielding layer 534i-2In this case, no light enters the central portion 51 from below the i-2 th light-shielding layer 533 and from between the i-2 th light-shielding layer 533 and the i-1 th light-shielding layer 534.
The schematic diagram in fig. 6 only illustrates a few light-shielding layers, and only the principle explanation is made here. The schematic diagram of the condition to be satisfied is shown in FIG. 6, and in FIG. 6, Δ BFG- Δ IHG, and IG-HE-h2According to the principle of similar triangle
Can be derived from
Similarly, delta BFK-delta MLK can be obtained
The distance between the upper layer of light-shielding layer far away from the light-sensitive element and the lower layer of light-shielding layer is obtained
It will be appreciated that the extension of the FG in fig. 6 has a width m according to the principle of defining a line at two pointsi-2M is determined since the intersection of the light-shielding layers is Hi-2In a first directionThe position of point H is critical, and point F needs to be shielded, that is, the inner side of the collimating hole of the next light shielding layer (e.g. points G and I) and the outer side of the collimating hole of the previous light shielding layer (e.g. points H and J) are exactly on a straight line passing point F, and at this time, the requirement is satisfied
In a first direction X, satisfy
In the meantime, no light in the same collimating aperture unit 5 enters the central portion 51 from between the i-th light shielding layer 535 and the i-1 th light shielding layer 534, so that the light reaching the light sensing element 30 is only one fingerprint valley or fingerprint ridge, which will not cause interference, and improves the accuracy of fingerprint identification.
It can be understood that the method is satisfied
While satisfying
No light enters the center 51 of the collimating aperture unit 5 from between the first light shielding layer 531 and the second light shielding layer 532, and no light enters the center 51 from between the ith light shielding layer 535 and the ith-1 light shielding layer 534, so that the light reaching the light sensing element 30 is only one fingerprint valley or fingerprint ridge, which does not cause interference, and improves the accuracy of fingerprint identification.
With continued reference to fig. 4 to 6, the top light-shielding layer 536 has a width m in the second direction Y0Wherein m is1＝m2＝…＝mi-2＝mi-1＝mi＝m0. That is, the widths of the first light-shielding layer 531, the second light-shielding layer 532 …, the i-2 light-shielding layer 533, the i-1 light-shielding layer 534, the i light-shielding layer 535, and the top light-shielding layer 536 in the second direction Y are all equal to each other, and the principle shown in fig. 5 and 6 is satisfied at the same time
And
under two conditions, no light enters the center portion 51 of the collimating aperture unit 5 from between the first light-shielding layer 531 and the second light-shielding layer 532, and no light enters the center portion 51 from between the i-th light-shielding layer 535 and the i-1 th light-shielding layer 534, so that the light reaching the light-sensing element 30 is only one fingerprint valley or fingerprint ridge, which does not cause interference, and improves the accuracy of fingerprint identification.
Referring to FIG. 7, FIG. 7 is a cross-sectional view taken along the direction A-A of FIG. 2, the top light-shielding layer 536 has a width m in the second direction0Wherein m is1＝m2＜…＜mi-2＜mi-1＜mi＜m0。
Fig. 7 includes a color filter substrate 1 and an array substrate 2 which are oppositely arranged, and a plurality of light sensing elements 30 are arranged on one side of the array substrate 2 close to the color filter substrate 1; the display panel further comprises a collimating hole unit 5, the collimating hole unit 5 penetrates through partial film layers of the color film substrate 1 and the array substrate 2 in a first direction X, the collimating hole unit 5 corresponds to the light sensing elements 30 one by one, and the first direction X is perpendicular to the display panel. The collimating hole unit 5 includes a central portion 51 and a light shielding portion 52, and an orthographic projection of the light shielding portion 52 on the color filter substrate 1 surrounds an orthographic projection of the central portion 51 on the color filter substrate 1. The light shielding portion 52 includes a plurality of light shielding layers 53 in the first direction X, and blocks light from entering the central portion 51 from gaps between the plurality of light shielding layers 53.
In fig. 7, only the light-shielding layer 53 is shown to include the first light-shielding layer 531, the second light-shielding layer 532 …, the i-1 light-shielding layer 534, the i-shielding layer 535, and the top light-shielding layer 536, and in the first direction X, the first light-shielding layer 531, the second light-shielding layer 532 …, the i-1 light-shielding layer 534, the i-shielding layer 535, and the top light-shielding layer 536 are gradually away from the plane where the light-sensing element 30 is located. The color film substrate 1 comprises a black matrix BM, and the ith light shielding layer 535 and the black matrix BM are arranged in the same layer; the top light-shielding layer 536 is located on a side of the black matrix BM away from the array substrate 2, where i is a positive integer greater than 2.
Due to the fact that the display surface isThe number of light shielding layers 53 cannot be increased infinitely in the panel, so that m is satisfied1＝m2＜…＜mi-2＜mi-1＜mi＜m0In this case, the width of the light-shielding layer 53 in the second direction Y gradually increases or decreases in the direction away from the light-sensing element 30, and thus the number of the light-shielding layers 53 can be reduced, the manufacturing process can be reduced, the cost can be reduced, and the requirements can be satisfied
And
these two conditions, the principle, are not described in detail here.
It can be understood that
While satisfying
No light enters the center 51 of the collimating aperture unit 5 from between the first light shielding layer 531 and the second light shielding layer 532, and no light enters the center 51 from between the ith light shielding layer 535 and the ith-1 light shielding layer 534, so that the light reaching the light sensing element 30 is only one fingerprint valley or fingerprint ridge, which does not cause interference, and improves the accuracy of fingerprint identification.
Referring to fig. 8, fig. 8 is a cross-sectional view taken along a line a-a of fig. 2. The top light-shielding layer 536 has a width m in the second direction Y0，m1＝m2＜…＜mi-2＜mi-1＜mi＞m0。
Fig. 8 includes a color filter substrate 1 and an array substrate 2 which are oppositely arranged, and a plurality of light sensing elements 30 are arranged on one side of the array substrate 2 close to the color filter substrate 1; the display panel further comprises a collimating hole unit 5, the collimating hole unit 5 penetrates through partial film layers of the color film substrate 1 and the array substrate 2 in a first direction X, the collimating hole unit 5 corresponds to the light sensing elements 30 one by one, and the first direction X is perpendicular to the display panel. The collimating hole unit 5 includes a central portion 51 and a light shielding portion 52, and an orthographic projection of the light shielding portion 52 on the color filter substrate 1 surrounds an orthographic projection of the central portion on the color filter substrate 1. The light shielding portion 52 includes a plurality of light shielding layers 53 in the first direction X, and blocks light from entering the central portion 51 from gaps between the plurality of light shielding layers 53.
In fig. 8, only the light-shielding layer 53 is shown to include the first light-shielding layer 531, the second light-shielding layer 532 …, the i-1 light-shielding layer 534, the i-shielding layer 535, and the top light-shielding layer 536, and in the first direction X, the first light-shielding layer 531, the second light-shielding layer 532 …, the i-1 light-shielding layer 534, the i-shielding layer 535, and the top light-shielding layer 536 are gradually away from the plane where the light-sensing element 30 is located. The color film substrate 1 comprises a black matrix BM, and the ith light shielding layer 535 and the black matrix BM are arranged in the same layer; the top light-shielding layer 536 is located on a side of the black matrix BM away from the array substrate 2, where i is a positive integer greater than 2.
Since the number of light-shielding layers 53 cannot be increased infinitely in the display panel, when m is satisfied1＝m2＜…＜mi-2＜mi-1＜mi＞m0In this case, that is, along the direction away from the light sensing element 30, the width of the light shielding layer 53 in the second direction Y is increased and then decreased, and the width of the i-th light shielding layer 535 in the second direction Y is maximized, so that the number of light shielding layers 53 can be reduced, the manufacturing process can be reduced, the cost can be reduced, and the requirements can be satisfied
And
these two conditions, the principle, are not described in detail here.
It can be understood that
While satisfying
The no light 53 enters the center portion 51 of the collimating hole unit 5 from between the first light-shielding layer 531 and the second light-shielding layer 532, and the no light enters from between the ith light-shielding layer 535 and the (i-1) th light-shielding layer 534The central portion 51, therefore, the light reaching the light sensing element 30 is only a fingerprint valley or fingerprint ridge, which will not cause interference, and the fingerprint recognition accuracy is improved.
Referring to fig. 9, fig. 9 is a cross-sectional view taken along a line a-a of fig. 2. In the first direction X, the planarizing layer P is included between adjacent light-shielding layers 53. The planarization layer P is optionally made of a material with high light transmittance, and since the planarization layer P is fabricated simultaneously with the planarization layer P in the central portion 51, light transmission through the central portion 51 is not affected.
Referring to fig. 10, fig. 10 is a schematic plan view illustrating a display panel according to another embodiment of the present invention; the display panel 100 in fig. 10 includes a display area AA including an opening area O arranged in an array and a non-opening area N surrounding the opening area O, wherein the collimating hole unit 5 and the light sensing element 30 are located in the non-opening area N.
It is understood that the collimating hole units 5 correspond to the light-sensing elements 30 one by one in the direction perpendicular to the display panel 100. Of course, the display panel 100 further includes a non-display area BB surrounding the display area AA. The shape of the collimating hole unit 5 in fig. 10 is a circle, and may be other shapes as long as the collimating hole unit 5 and the light sensing element 30 are disposed in the non-opening area N, which is not particularly limited herein. It is understood that the opening area O is an area through which light passes. In addition, the number of the pixels 4 and the number of the collimating hole units 5 in fig. 10 are only schematic, and the present invention is not limited thereto.
The collimating hole unit 5 and the light sensing element 30 need to occupy a certain space, and the collimating hole unit 5 and the light sensing element 30 are disposed in the non-opening area N, so that it can be ensured that the display of the opening area O is not affected.
With continued reference to fig. 10, the length of the opening area O in the second direction Y, which intersects the first direction X, is equal to the distance between two adjacent collimating hole units 5.
The collimating hole unit 5 and the light sensing element 30 need to occupy a certain space, and the collimating hole unit 5 and the light sensing element 30 are disposed in the non-opening area N, so that it can be ensured that the display of the opening area O is not affected. Meanwhile, the length of the opening area O in the second direction Y is equal to the distance between two adjacent collimating hole units 5, the space of the non-opening area N can be fully utilized, the luminous flux entering the collimating hole units 5 is ensured, and the fingerprint identification precision is improved.
The shape of the center part is any one of a circle, a square and a rectangle. With reference to fig. 2, only the central portion 51 is shown to be circular in fig. 2, but it may also be in other shapes, such as an oval shape or a rectangular shape, the shape of the central portion 51 determines the shape of the light spot, and of course, as long as the light of the same fingerprint ridge or fingerprint valley can reach the light sensing element 30 through the central portion 51, the light shielding portion 52 around the central portion 51 can restrain the light entering the central portion, so as to improve the accuracy of fingerprint identification, and the shape of the collimating hole is not particularly limited.
Referring to fig. 11, fig. 11 is a schematic plan view of another display panel provided in the present invention. The display panel 100 includes a display area AA and a non-display area BB surrounding the display area AA, the display panel 100 includes a fingerprint identification area 60, the light sensing element 30 and the collimating hole unit 5 are both located in the fingerprint identification area 60, and an orthogonal projection of the fingerprint identification area 60 on the array substrate at least partially coincides with an orthogonal projection of the display area AA on the array substrate. The fingerprint identification area 60 is shown only schematically in fig. 11, and actually the fingerprint identification area 60 may be 1/4 screens, half screens, or full screens. That is, the fingerprint identification area 60 is at least partially overlapped with the display area AA, when the fingerprint identification area 60 is 1/4 screen or half screen, the fingerprint identification area 60 is partially overlapped with the display area AA, the local fingerprint identification function of the display panel 100 can be realized through the fingerprint identification area 60, the wiring of the light sensing element 30 is reduced, and the manufacturing is facilitated; when the fingerprint identification area 60 is full screen, the fingerprint identification area 60 and the display area AA are completely overlapped, and any position on the screen touched by a finger can trigger the light sensation element 30 to perform fingerprint identification, so that the full screen fingerprint identification function is realized, and the fingerprint identification is more convenient and faster.
In some optional embodiments, please refer to fig. 12, fig. 12 is a schematic structural diagram of a display device provided in the present invention, and the display device 200 provided in the present embodiment includes the display panel 100 in the above embodiments. The display device 200 in the embodiment of fig. 12 is described by taking a mobile phone as an example, but it should be understood that the display device 200 provided in the embodiment of the present invention may be other display devices 200 having a display function, such as a computer, a television, an electronic paper, and a vehicle-mounted display device, and the present invention is not limited thereto. The display device 200 provided in the embodiment of the present invention has the beneficial effects of the display panel 100 provided in the embodiment of the present invention, and specific reference may be made to the specific description of the display panel 100 in the foregoing embodiments, and the detailed description of the embodiment is not repeated herein.
As can be seen from the above embodiments, the display panel and the display device provided by the present invention at least achieve the following beneficial effects:
the display panel provided by the invention comprises an alignment hole unit, wherein the alignment hole unit penetrates through the color film substrate and part of film layers of the array substrate in a first direction, and the alignment hole unit corresponds to the light sensing elements one by one; the collimating hole unit comprises a central part and a shading part, and the orthographic projection of the shading part on the color film substrate surrounds the orthographic projection of the central part on the color film substrate; the shading part comprises a plurality of shading layers in the first direction, light is blocked from entering the central part from gaps among the shading layers, and non-reflected light enters the central part through the opening area, so that the light reaching the light sensing element is only a fingerprint valley or a fingerprint ridge, interference is avoided, and the fingerprint identification precision is improved.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (12)
1. A display panel comprises a color film substrate and an array substrate which are oppositely arranged,
a plurality of light sensing elements are arranged on one side of the array substrate close to the color film substrate;
the display panel further comprises an alignment hole unit, the alignment hole unit penetrates through the color film substrate and part of the film layers of the array substrate in a first direction, the alignment hole unit and the light sensing elements are in one-to-one correspondence, and the first direction is perpendicular to the display panel;
the collimating hole unit comprises a central part and a shading part, and the orthographic projection of the shading part on the color film substrate surrounds the orthographic projection of the central part on the color film substrate;
the light shielding portion includes a plurality of light shielding layers in a first direction, and blocks light from entering the central portion from gaps between the plurality of light shielding layers;
the plurality of light shielding layers at least comprise a first light shielding layer, a second light shielding layer … (i-2) light shielding layer, an i-1 light shielding layer and a top light shielding layer, and in the first direction, the first light shielding layer, the second light shielding layer … (i-2) light shielding layer, the i-1 light shielding layer and the top light shielding layer are gradually far away from the plane where the light sensing element is located, wherein i is a positive integer larger than 2;
the distance between two adjacent collimation hole units in the second direction is n;
the width of the first shading layer in the second direction is m1，
The distance between the first light shielding layer and the plane of the light sensing element in the first direction is 0;
the distance between the second light shielding layer and the plane where the first light shielding layer is located in the first direction is h1；
The distance between the ith shading layer and the plane where the light sensing element is located is a; the distance between the i-1 th shading layer and the plane of the light sensing element is g, wherein,
the second direction intersects the first direction.
2. The display panel according to claim 1,
the color film substrate comprises a black matrix, and the ith shading layer and the black matrix are arranged on the same layer; the top layer light shielding layer is located on one side, far away from the array substrate, of the black matrix.
3. The display panel according to claim 1, wherein an inner diameter of the center portion is d;
the distance between the adjacent light shielding layers from the second light shielding layer to the ith light shielding layer is h2、h3…hi-2、hi-1，
The second light-shielding layer … has a width m in the second direction of the i-2, i-1 and i-th light-shielding layers2、…mi-2、mi-1、mi；
Wherein
4. The display panel of claim 3, wherein the top light shielding layer has a width m in the second direction0Wherein m is1＝m2＝…＝mi-2＝mi-1＝mi＝m0。
5. The display panel of claim 3, wherein the top light shielding layer has a width m in the second direction0Wherein m is1＝m2＜…＜mi-2＜mi-1＜mi＜m0。
6. The display panel of claim 3, wherein the top light shielding layer has a width m in the second direction0，m1＝m2＜…＜mi-2＜mi-1＜mi＞m0。
7. The display panel according to claim 1, wherein a planarization layer is included between adjacent light-shielding layers in the first direction.
8. The display panel according to claim 1, wherein the display panel comprises a display area, the display area comprises an array of open areas and a non-open area surrounding the open areas, and wherein the collimating hole units and the light sensing elements are located in the non-open area.
9. The display panel according to claim 8, wherein the length of the opening area in a second direction is equal to the distance between two adjacent collimating hole units, the second direction crossing the first direction.
10. The display panel according to claim 1, wherein the center portion has a shape selected from the group consisting of a circle, a square, and a rectangle.
11. The display panel of claim 8, wherein the display panel comprises a fingerprint identification area, the light sensing elements and the collimating hole units are located in the fingerprint identification area, and an orthographic projection of the fingerprint identification area on the array substrate at least partially coincides with an orthographic projection of the display area on the array substrate.
12. A display device comprising the display panel according to any one of claims 1 to 11.
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| CN110908174B (en) * | 2019-12-26 | 2022-09-20 | 厦门天马微电子有限公司 | Display panel and display device |
| CN111160323B (en) | 2020-02-19 | 2023-08-01 | 武汉华星光电技术有限公司 | Display panel and electronic device |
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