CN112307951B - Display device - Google Patents
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- CN112307951B CN112307951B CN202011182492.2A CN202011182492A CN112307951B CN 112307951 B CN112307951 B CN 112307951B CN 202011182492 A CN202011182492 A CN 202011182492A CN 112307951 B CN112307951 B CN 112307951B
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- display device
- fingerprint identification
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- 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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- 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
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- 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
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
Abstract
The embodiment of the invention discloses a display device, which comprises: a display functional layer comprising a thin film transistor array; the light sensing device is positioned in the fingerprint identification area; the optical alignment structure layer comprises an optical alignment structure, the optical alignment structure comprises an optical wave plate, and the optical wave plate is used for reducing the light intensity difference of light rays which are emitted to a film layer on one side, far away from the light-emitting device layer, of the thin film transistor array and reflected to the display function layer in unit areas of the fingerprint identification area and the non-fingerprint identification area. After the light reflected by the finger reaches the optical wave plate, energy loss occurs at the optical wave plate, the intensity of the light reflected by the optical wave plate is weaker than that of incident light, the intensity difference of the light reflected by the film layer on one side, far away from the light-emitting device layer, of the thin film transistor array on the unit area of the fingerprint identification area and the non-fingerprint identification area can be reduced, and the display uniformity of the display panel is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display device.
Background
With the development of display technology, the off-screen identification technology has become one of the main fingerprint identification technologies.
In the existing technology for identifying fingerprints under a screen, the technology for identifying the fingerprints by light sensation is a main implementation means. This technique relies on the local highlight that the display screen sent to transfer user's fingerprint information to the fingerprint light sensor who is located the display module assembly below, and the sensor is the light signal conversion who has fingerprint information and is the signal of telecommunication and discern.
However, the conventional display device for light-sensing fingerprint identification has the problem that the display panel is not uniform in display.
Disclosure of Invention
The invention provides a display device, which is used for improving the display uniformity of a display panel and ensuring the good display effect of the display panel.
The embodiment of the invention provides a display device which is divided into a fingerprint identification area and a non-fingerprint identification area; the display device includes:
the display function layer comprises a thin film transistor array and a light-emitting device layer positioned on one side of the thin film transistor array;
the light sensing device is arranged on one side of the thin film transistor array, which is far away from the light emitting device layer, and the light sensing device is positioned in the fingerprint identification area;
the optical alignment structure layer is arranged between the light sensor and the display function layer; the optical alignment structure layer comprises an optical alignment structure, the optical alignment structure is arranged in the fingerprint identification area, and the optical alignment structure corresponds to the light sensing device in the thickness direction of the display device; the optical collimating structure comprises an optical wave plate, and the optical wave plate is used for reducing the intensity difference of light rays reflected to the display functional layer by the light rays emitted to the film layer on the side, far away from the light-emitting device layer, of the thin film transistor array in the unit area of the fingerprint identification area and the non-fingerprint identification area.
Optionally, the optical wave plate is a 1/4 wave plate.
Optionally, the optical wave plate is configured to weaken light intensity of reflected light corresponding to incident light in a set wavelength range, where the set wavelength range is at least one of a wavelength range corresponding to red light, a wavelength range corresponding to green light, a wavelength range corresponding to blue light, and a wavelength range corresponding to infrared light;
optionally, the wavelength range is set to a wavelength range corresponding to green light.
Optionally, the display device further includes a substrate, and the display functional layer and the light-sensing device are disposed on opposite sides of the substrate;
the display device further comprises an adhesive layer, the adhesive layer is arranged on one side, far away from the display function layer, of the substrate, the adhesive layer is provided with an opening, the opening corresponds to the fingerprint identification area, and the optical alignment structure is arranged in the opening.
Optionally, the display device further includes a supporting layer, the supporting layer is located between the substrate and the adhesive layer, and the supporting layer is disposed in both the fingerprint identification area and the non-fingerprint identification area;
optionally, the refractive index of the optical collimating structure is smaller than the refractive index of the supporting layer.
Optionally, the display device further includes a support layer, the support layer is located between the substrate and the adhesive layer, and the support layer is disposed in the non-fingerprint identification area.
Optionally, the refractive index of the optical collimating structure is greater than the refractive index of air.
Optionally, the substrate, the display function layer, the adhesive layer, and the optical collimating structure are included in a display panel of the display device, and the light sensor device is externally hung on the display panel.
Optionally, the display device further includes a substrate, the light sensing device is disposed between the display functional layer and the substrate, the display functional layer, the optical collimating structure, and the light sensing device are included in a display panel of the display device.
Optionally, the refractive index of the optical collimating structure is greater than the refractive index of the setting structure layer, and the setting structure layer is a structure layer contacting the optical collimating structure on the side of the optical collimating structure close to the display function layer.
The embodiment of the invention provides a display device, which comprises: a display functional layer comprising a thin film transistor array; the light sensing device is positioned in the fingerprint identification area; the optical alignment structure layer comprises an optical alignment structure, the optical alignment structure is arranged in the fingerprint identification area, and the optical alignment structure corresponds to the light sensing device in the thickness direction of the display device; the optical collimating structure comprises an optical wave plate, and the optical wave plate is used for reducing the intensity difference of light rays reflected to the display functional layer by the light rays emitted to the film layer on the side, far away from the light-emitting device layer, of the thin film transistor array in the unit area of the fingerprint identification area and the non-fingerprint identification area. Make after the light that is reflected by the finger reachs optical wave plate, energy loss takes place in optical wave plate department, the intensity of the light that is reflected by optical wave plate is less than incident light's intensity, can reduce the rete that light emitting device layer one side was kept away from to the thin film transistor array and distinguish the intensity difference of reflection light on fingerprint identification district and non-fingerprint identification district unit area, make the light intensity that each thin film transistor channel was shone in the display function layer comparatively unanimous, and then when making pixel circuit drive light emitting device, light emitting device's luminance can comparatively unanimous, and then improve display panel and show the homogeneity.
Drawings
Fig. 1 is a top view of a display device according to an embodiment of the present invention;
fig. 2 is a sectional view of a display device according to an embodiment of the present invention;
fig. 3 is a cross-sectional view of another display device provided by an embodiment of the present invention;
fig. 4 is a sectional view of another display device provided in an embodiment of the present invention;
fig. 5 is a sectional view of another display device provided in an embodiment of the present invention;
fig. 6 is a sectional view of another display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As described in the background art, the conventional display device with light sensing fingerprint identification has the problem of uneven display of the display panel. The inventors have found that the above problems occur because the conventional light-sensitive fingerprint identification display device generally includes a display functional layer for displaying, the display functional layer generally includes a pixel circuit for driving a light-emitting device to emit light, the pixel circuit includes a thin film transistor, and the performance of the thin film transistor affects the light-emitting performance of the light-emitting device. The display device further comprises an identification functional layer for fingerprint identification, wherein the identification functional layer typically comprises a light-sensitive device. The identification functional layer is usually arranged below the display functional layer, and the light sensation fingerprint identification display device generally comprises a fingerprint identification area and a non-fingerprint identification area, wherein a light sensation device in the identification functional layer is arranged in the fingerprint identification area, and the non-fingerprint identification area does not need to be provided with the light sensation device, so that the structures of the identification functional layer and/or the adjacent film layers of the identification functional layer of the display device are different, so that light rays are reflected to the identification functional layer or the adjacent film layers of the identification functional layer through fingerprints of fingers, the light rays are reflected again to different degrees, and generally, for the same film layer in the identification functional layer or the adjacent film layers of the identification functional layer of the fingerprint identification area and the non-fingerprint identification area, the reflection intensity of the fingerprint identification area in unit area is higher than that of the non-fingerprint identification area. After being reflected by the identification functional layer or a film layer near the identification functional layer, light rays can possibly irradiate a channel region of the thin film transistor of the display functional layer, because the reflection intensity of the fingerprint identification region is higher than that of the non-fingerprint identification region, relative to the non-fingerprint identification region, the thin film transistor irradiated by the light rays reflected by the identification functional layer or a film layer adjacent to the identification functional layer in the fingerprint identification region is easier to generate characteristic drift, and the characteristic drift of the thin film transistor directly influences the driving of a pixel circuit where the thin film transistor is located on a light-emitting device, so that the light-emitting performance of the light-emitting device can be influenced, for example, the light-emitting brightness of the light-emitting device can be influenced, and finally, the display of the display device is uneven.
In view of the above problems, an embodiment of the present invention provides a display device, where fig. 1 is a top view of the display device provided by the embodiment of the present invention, fig. 2 is a cross-sectional view of the display device provided by the embodiment of the present invention, the cross-sectional view shown in fig. 2 can be taken along a section line B-B' corresponding to fig. 1, and referring to fig. 1 and 2, the display device 10 is divided into a fingerprint identification area FA and a non-fingerprint identification area NFA; the display device 10 includes:
a display function layer 110, the display function layer 110 including a thin film transistor array 111 and a light emitting device layer 112 on one side of the thin film transistor array 111;
the light sensing device 120 is arranged on one side of the thin film transistor array 111 far away from the light emitting device layer 112, and the light sensing device 120 is positioned in the fingerprint identification area FA;
an optical alignment structure layer 130 disposed between the optical sensor device 120 and the display function layer 110; the optical collimating structure layer 130 includes an optical collimating structure 131, the optical collimating structure 131 is disposed in the fingerprint identification area FA, and in the thickness direction y of the display device, the optical collimating structure 131 corresponds to the light sensing device 120; the optical collimating structure 131 includes an optical wave plate for reducing a difference in intensity of light reflected to the display functional layer 110 per unit area of the fingerprint identification area FA and the non-fingerprint identification area NFA, by light directed to a film layer of the thin film transistor array 111 on a side away from the light emitting device layer 112.
Specifically, the display function layer 110 may be an organic light emitting diode display function layer, a liquid crystal display function layer, a quantum dot light emitting diode display function layer, a micro light emitting diode display function layer, or the like, which is not limited herein. The display function layer 110 includes a thin film transistor array 111 and a light emitting device layer 112 on one side of the thin film transistor array 111, wherein the thin film transistor array 111 may include a plurality of pixel circuits, each of which may include at least two thin film transistors 1111 and may further include a capacitor. Taking the display function layer 110 as the organic light emitting diode display function layer 110 as an example for explanation, in this case, the light emitting device layer 112 included in the display function layer 110 is an organic light emitting diode device layer, the organic light emitting diode device layer may include a plurality of organic light emitting diodes, the light emitting luminance of the organic light emitting diodes is controlled by the pixel circuit in the thin film transistor array 111, and the pixel circuit controls the light emitting luminance of the organic light emitting diodes by controlling the magnitude of the current flowing into the organic light emitting diodes. The light emitting device layer 112 may include a first electrode, a hole injection layer, a hole transport layer, a light emitting material layer, an electron transport layer, an electron injection layer, and a second electrode, which may be an anode, disposed from bottom to top.
The display device further includes a light sensing device 120, the light sensing device 120 may be a fingerprint identification sensor, the light sensing device 120 is disposed on a layer of the thin film transistor array 111 away from the light emitting device layer 112, and the light sensing device 120 may be configured to sense light emitted by the light emitting device layer 112 after being reflected by a fingerprint, and convert a sensed light signal into an electrical signal. The display device may include a fingerprint recognition chip 200, and the light sensing device may transmit the converted electrical signal to the fingerprint recognition chip 200, thereby implementing fingerprint recognition.
The display device further comprises an optical collimating structure layer 130, the optical collimating structure layer 130 comprises an optical collimating structure 131, the optical collimating structure 131 is also arranged in the fingerprint identification area FA and corresponds to the light sensing device 120, the optical collimating structure 131 comprises an optical wave plate, the optical wave plate can be light-transmitting, light reflected by fingerprints can be ensured to penetrate through the optical wave plate to penetrate into the light sensing device 120, and further the realization of the fingerprint identification function of the display device is ensured.
The optical wave plate may serve to reduce a difference in intensity of light reflected to the display functional layer 110 per unit area of the fingerprint identification region FA and the non-fingerprint identification region NFA by the light directed to the film layer on the side of the thin film transistor array 111 away from the light emitting device layer 112. Optionally, the optical wave plate is a 1/4 wave plate, after the light reflected by the finger passes through the display function layer and reaches the 1/4 wave plate, the light reflected by the 1/4 wave plate to the display function layer 110 has a loss of a half wavelength, so that the intensity of the light reflected to the channels of the thin film transistors in the unit area of the fingerprint identification region FA is weakened, and when the light is reflected to the film structure of the non-fingerprint identification region NFA below the display function layer 110 by the finger, the intensity of the reflected light is weaker, so that the display device of this embodiment can reduce the intensity difference of the light reflected by the film layer below the display function layer 110 (the film layer on the side of the thin film transistor array 111 away from the light emitting device layer 112) in the unit area of the fingerprint identification region FA and the non-fingerprint identification region NFA, so that the intensities of the light irradiated by the thin film transistors in the display function layer 110 are relatively consistent, the performance of the thin film transistors 1111 can be relatively consistent, and further, when the pixel circuit drives the light emitting devices, the brightness of the light emitting devices can be relatively consistent 1111, thereby improving the display uniformity of the display panel. Since the intensity of the light reflected by the 1/4 wave plate is weakened, the intensity of the light passing through the 1/4 wave plate is relatively higher, so that the intensity of the light emitted to the light sensing element 120 is higher, and the fingerprint identification accuracy is improved.
It should be noted that, in the above embodiment, the optical wave plate is taken as a 1/4 wave plate for example, the optical wave plate may also be another wave plate which makes the reflected light intensity of the incident light lower than the incident light intensity, that is, a wave plate which has the function of reducing the reflected light intensity, and the embodiment is not limited in particular herein.
It should be further noted that fig. 1 only illustrates that a specific area of the display device is a fingerprint identification area FA, and other areas are non-fingerprint identification areas NFA, the display device may further include a plurality of fingerprint identification areas FA, and correspondingly, the display device may include a plurality of light sensing devices 120, which is not limited in this embodiment.
The display device provided by the embodiment comprises the following components by setting: a display functional layer comprising a thin film transistor array; the light sensing device is positioned in the fingerprint identification area; the optical alignment structure layer comprises an optical alignment structure, the optical alignment structure is arranged in the fingerprint identification area, and the optical alignment structure corresponds to the light sensing device in the thickness direction of the display device; the optical collimating structure comprises an optical wave plate, and the optical wave plate is used for reducing the intensity difference of light rays reflected to the display functional layer by the light rays emitted to the film layer on the side, far away from the light-emitting device layer, of the thin film transistor array in the unit area of the fingerprint identification area and the non-fingerprint identification area. Make after the light that is reflected by the finger reachs optical wave plate, energy loss takes place in optical wave plate department, the intensity of the light that is reflected by optical wave plate is less than incident light's intensity, can reduce the rete that light emitting device layer one side was kept away from to the thin film transistor array and distinguish the intensity difference of reflection light on fingerprint identification district and non-fingerprint identification district unit area, make the light intensity that each thin film transistor channel was shone in the display function layer comparatively unanimous, and then when making pixel circuit drive light emitting device, light emitting device's luminance can comparatively unanimous, and then improve display panel and show the homogeneity.
On the basis of the above technical solution, optionally, the optical wave plate is configured to weaken the light intensity of the reflected light corresponding to the incident light in a set wavelength range, where the set wavelength range is at least one of a wavelength range corresponding to red light, a wavelength range corresponding to green light, a wavelength range corresponding to blue light, and a wavelength range corresponding to infrared light.
In particular, the optical waveplate may be selected for a particular wavelength range of light. The light emitting device layer in the display panel may include light emitting devices of a plurality of colors, such as red light emitting devices, blue light emitting devices, and green light emitting devices, and the optical wave plate may be a wave plate that attenuates the intensity of reflected light from a wavelength range of one of a red wavelength range, a green wavelength range, and a blue wavelength range. In the display panel, external natural light is inevitably emitted, and the optical wave plate can weaken the reflection intensity of infrared light aiming at the wavelength range corresponding to the infrared light of the external natural light; the optical wave plate can also weaken the reflection intensity of the ultraviolet light aiming at the wavelength range of the ultraviolet light of the external natural light. No matter the set wavelength range is the wavelength range corresponding to red light, the wavelength range corresponding to green light, the wavelength range corresponding to blue light, the wavelength range corresponding to infrared light or the wavelength range corresponding to ultraviolet light, light reflected by a finger can be emitted to the optical wave plate, the total intensity of reflected light can be weakened, the intensity difference of reflected light of the film layer on one side, away from the light-emitting device layer, of the thin film transistor array on the unit area of the fingerprint identification area and the unit area of the non-fingerprint identification area can be reduced, and the intensity of the light irradiated by each thin film transistor channel in the display function layer is enabled to be consistent.
On the basis of the above technical solution, optionally, the wavelength range is set to be the wavelength range corresponding to the green light.
Specifically, in ruddiness, the green glow, in blue light and the infrared light, the intensity of green glow is the biggest usually, consequently, set up and set for the wavelength range that the wavelength range corresponds for the green glow, make after light jets into the optical wave plate, the energy of loss is also the most, and then can weaken reflected light's intensity more, reduce the intensity difference that the rete that the thin film transistor array kept away from light emitting device layer one side reflected light on fingerprint identification district and non-fingerprint identification district unit area more, and then make the light intensity that each thin film transistor channel shines in the display function layer comparatively unanimously more, and then when making pixel circuit drive light emitting device, light emitting device's luminance can be comparatively unanimous, and then improve display panel and show the homogeneity.
Specifically, the optical wave plates with different thicknesses can be selected according to different set wavelength ranges. The principle that the optical wave plate weakens the light intensity of the reflected light corresponding to the incident light with the set wavelength mainly utilizes the film interference phenomenon, and the optical wave plate can be an antireflection film and used for increasing the transmitted light and reducing the reflected light. The light reflected by the front surface and the back surface of the antireflection film (which can respectively correspond to the surface of the optical wave plate close to the display functional layer and the surface far away from the display functional layer) are mutually superposed to form a vibration attenuation area, the vibration attenuation requirement is that the wave path difference of the two lights is odd times of half wavelength, and the wave path difference in the film interference is twice of the film thickness (namely is considered to be twice of the thickness of the optical wave plate), and the vibration attenuation area is expressed by a formula:
thus the thickness of the optical waveplate
Where Δ s denotes a wave path difference, d denotes a thickness of the optical wave plate, λ denotes a wavelength of light of a set range, and n is an integer greater than or equal to 0.
Fig. 3 is a cross-sectional view of another display device provided by an embodiment of the present invention, and referring to fig. 3, the display device further includes a substrate 140, and the display functional layer 110 and the light-sensing device 120 are disposed on opposite sides of the substrate 140;
the display device further comprises an adhesive layer 150, the adhesive layer 150 being arranged on a side of the substrate 140 facing away from the display functional layer 110, the adhesive layer 150 being provided with openings, which correspond to the fingerprint recognition areas FA, in which the optical collimating structures 131 are arranged.
Specifically, the display device may include a display panel and a fingerprint identification module, and when the display functional layer 110 and the light sensing device 120 are disposed on the opposite side of the substrate 140, the light sensing device 120 belongs to the fingerprint identification module and does not belong to the display panel. The display device comprises an adhesive layer 150, and the fingerprint identification module can be combined with the display panel through the adhesive layer 150. Optionally, the adhesive layer 150 is an opaque film layer, for example, the adhesive layer 150 may be a composite tape, and the optical alignment structure 131 is a transparent film layer, so that light reflected by a finger cannot pass through the adhesive layer 150, but only reaches the light sensing device 120 through the optical alignment structure 131, which is beneficial to improving the fingerprint identification accuracy. In the conventional display device, no structure is usually provided at the opening position of the adhesive layer 150, and the opening region can be considered to be filled with air, so that light reflected by a finger reaches the region where no opening is provided in the adhesive layer 150 (i.e., the non-fingerprint identification region NFA) and the region where an opening is provided in the adhesive layer 150 (i.e., the fingerprint identification region FA), and is reflected again toward the display functional layer 110 by the material of the adhesive layer 150 and the air, respectively, because the opaque film layers are collectively referred to as black and have a light absorption effect, when reaching the material surface of the adhesive layer 150, the light reflected toward the display functional layer 110 is less, and accordingly, the reflected light intensity per unit area is weaker; when the light reaches the air at the opening of the adhesive layer 150, more light is reflected to the display functional layer 110, and accordingly, the intensity of the reflected light per unit area is stronger, so that the intensities of the light reflected to different areas of the thin film transistor array are different, which causes inconsistent change of characteristics of the thin film transistor and uneven display. The structure of the display device of this embodiment is different from that of the conventional display device, the optical collimating structure 131 (optical wave plate) is disposed at the opening of the adhesive layer 150, so that after the light reaches the optical collimating structure 131, the intensity of the light transmitted to the light sensing device 120 is increased, and the intensity of the reflected light at the opening of the adhesive layer 150 is decreased.
Optionally, the refractive index of the optical collimating structure 131 is greater than the refractive index of air. Specifically, for the conventional display device, since the opening of the adhesive layer 150 can be considered as air filling, and the refractive index of the substrate 140 is generally greater than that of air, when light reflected by a finger enters air from the substrate 140, the light is transmitted from the optically dense medium to the optically sparse medium, so that total reflection easily occurs, and more light is reflected to the display functional layer 110 through air. In this embodiment, the refractive index of the optical collimating structure 131 is greater than the refractive index of air, so that the critical angle of total reflection can be increased, and total reflection can be reduced, and further the number of light rays reflected to the thin film transistor array 111 in the fingerprint identification area FA can be reduced, and accordingly, the intensity of light rays reflected to the thin film transistor array 111 in the fingerprint identification area FA can be reduced, and the display uniformity of the display panel can be improved.
With continued reference to fig. 3, optionally, the thickness h2 of the optical alignment structure 131 is equal to the thickness h1 of the adhesive layer 150, so that the flatness of the display device can be better. Wherein the thickness h2 of the optical collimating structure 131 may refer to the largest dimension of the optical collimating structure 131 in the thickness direction y of the display panel.
Fig. 4 is a cross-sectional view of another display device provided by an embodiment of the invention, and referring to fig. 4, the display device further includes a support layer 160, wherein the support layer 160 is disposed between the base 140 and the adhesive layer 150, and the support layer 160 is disposed in both the fingerprint identification area FA and the non-fingerprint identification area NFA.
Specifically, the supporting layer 160 may be made of a material with high mechanical strength, so as to ensure the supporting effect on the display panel. The supporting layer 160 of the present embodiment may be a light-transmitting material, such as PMMA acrylic material. In practical use, the user can select the material of the supporting layer 160 according to the requirement, which is not limited in this embodiment. And, supporting layer 160 can alleviate the extrusion stress when fingerprint identification module and display panel laminating, the damage of fingerprint identification module or display panel that causes when avoiding the display device assembly. Optionally, a buffer layer (not shown) may be further included between the support layer 160 and the adhesive layer 150 to further buffer the compressive stress during the assembly of the display device.
Based on the above technical solution, optionally, the refractive index of the optical collimating structure 131 is smaller than the refractive index of the supporting layer 160. Also, since the thickness of the optical wave plate is generally thin, the thickness of the optical alignment structure 131 is optionally smaller than the thickness of the adhesive layer 150, wherein a gap may be formed between the optical alignment structure 131 and the light sensing device 120, and the gap may be considered as air. In the conventional display device, light reflected by a finger is incident into air through the support layer 160; in the display device of the embodiment, the optical collimating structure 131 is added, so that the light reflected by the finger enters the air through the optical collimating structure 131, and the refractive index of the optical collimating structure 131 is smaller than that of the supporting layer 160, so that compared with the conventional display device in which the light enters the air from the supporting layer 160, the critical angle of total reflection can be increased, thereby reducing reflection, further reducing the light emitted from the fingerprint identification area FA to the channel of the thin film transistor, and improving the display uniformity.
Fig. 5 is a cross-sectional view of another display device provided by an embodiment of the invention, and referring to fig. 5, the display device further includes a support layer 160, the support layer 160 is disposed between the substrate 140 and the adhesive layer 150, and the support layer 160 is disposed in the non-fingerprint identification region NFA.
Unlike the display device shown in fig. 4, in the display device of the present embodiment, the supporting layer 160 is only disposed in the non-fingerprint identification region NFA, and the supporting layer 160 is not disposed in the fingerprint identification region FA. For the display device structure shown in fig. 5, the optical collimating structure 131 may serve as the supporting layer 160 in the fingerprint identification area FA. Compared with the display device shown in fig. 4, in the display device of this embodiment, the interface between the substrate 140 and the supporting layer 160 can be reduced in the fingerprint identification area FA, so that the light reflected by the finger directly enters the optical collimating structure 131 after passing through the substrate 140, and then the interface reflection between the substrate 140 and the supporting layer 160 can be reduced, which is beneficial to further reducing the light reflected to the thin film transistor 1111 of the display functional layer 110, and further beneficial to further improving the display uniformity. Moreover, since the interface reflection is reduced, the light reaching the light sensing device 120 is increased, which is further beneficial to further improving the accuracy of fingerprint identification.
With continued reference to fig. 5, the thickness h2 of the optical collimating structure 131 is equal to the sum of the thickness h1 of the adhesive layer 150 and the thickness h3 of the support layer 160. Since the support layer 160 is not disposed in the fingerprint identification area FA for the display device shown in fig. 5, disposing the optical alignment structure 131 with the thickness h2 equal to the sum of the thickness h1 of the adhesive layer 150 and the thickness h3 of the support layer 160 can be beneficial for improving the flatness of the display device.
Optionally, for the display device shown in fig. 2 to 5 in the above embodiment of the present invention, optionally, the substrate 140, the display functional layer 110, the adhesive layer 150, and the optical alignment structure layer 130 are included in a display panel of the display device, and the light sensing device 120 is externally hung on the display panel; therefore, when the display panel is manufactured, the existing process steps do not need to be changed, and the manufacturing process of the display panel is simplified.
Referring to fig. 6, the display device further includes a substrate 140, the optical sensor 120 is disposed between the display functional layer 110 and the substrate 140, the display functional layer 110, the optical alignment structure layer 130, and the optical sensor 120 are included in the display panel of the display device.
In this embodiment, the optical alignment structure layer 130, the light sensing device 120, the substrate 140, and the display function layer 110 are all included in the display panel of the display device, that is, the light sensing device 120 and the optical alignment structure layer 130 are formed in the manufacturing process of the display panel, so that the bonding and fixing process with the external fingerprint identification module after the display panel is manufactured can be reduced, and the damage to the display device caused by the bonding of the surface display panel and the external fingerprint identification module can be avoided. For example, the light sensing device 120 may be a photodiode; on both sides of the light sensing device 120 and the optical collimating structure 131, an insulating material may be provided.
In another optional embodiment of the present invention, the refractive index of the optical alignment structure is greater than the refractive index of the setting structure layer, and the setting structure layer is a structure layer contacting the optical alignment structure on a side of the optical alignment structure close to the display function layer. For the display devices shown in fig. 2 and 6, the structural layer is set as a film layer in the thin film transistor array 111, which is in contact with the optical alignment structure 131; for the display devices shown in fig. 3 and 5, the structural layer is set as the substrate 140; for the display device shown in fig. 4, the structural layer is set as the support layer 160.
Specifically, one of the conditions for occurrence of total reflection is that light is emitted from the optically denser medium to the optically thinner medium, so that the refractive index of the optical collimating structure is set to be greater than the refractive index of the structural layer contacting the optically collimating structure on the side close to the substrate, and light reflected by a finger is emitted from the optically thinner medium to the optically denser medium when the structural layer contacting the optical collimating structure emits to the optical collimating structure, thereby avoiding occurrence of total reflection, facilitating reduction of light reflected by the optical collimating structure to the channel of the thin film transistor in the thin film transistor array, and further improving display uniformity.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in some detail by the above embodiments, the invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the invention, and the scope of the invention is determined by the scope of the appended claims.
Claims (12)
1. A display device is characterized by being divided into a fingerprint identification area and a non-fingerprint identification area; the display device includes:
the display function layer comprises a thin film transistor array and a light-emitting device layer positioned on one side of the thin film transistor array;
the light sensing device is arranged on one side, far away from the light emitting device layer, of the thin film transistor array and is positioned in the fingerprint identification area;
the optical alignment structure layer is arranged between the light sensing device and the display function layer; the optical alignment structure layer comprises an optical alignment structure, the optical alignment structure is arranged in the fingerprint identification area, and in the thickness direction of the display device, the optical alignment structure corresponds to the light sensing device; the optical alignment structure comprises an optical wave plate, and the optical wave plate is used for reducing the intensity difference of light rays reflected to a display functional layer on the unit area of the fingerprint identification area and the non-fingerprint identification area when the light rays emitted to the film layer on the side, far away from the light-emitting device layer, of the thin film transistor array.
2. The display device according to claim 1, wherein the optical wave plate is a 1/4 wave plate.
3. The display device according to claim 2, wherein the optical wave plate is configured to reduce the intensity of the reflected light corresponding to the incident light in a set wavelength range, and the set wavelength range is at least one of a wavelength range corresponding to red light, a wavelength range corresponding to green light, a wavelength range corresponding to blue light, and a wavelength range corresponding to infrared light.
4. The display device according to claim 3, wherein the set wavelength range is a wavelength range corresponding to green light.
5. The display device according to claim 1, further comprising a substrate, wherein the display functional layer and the light-sensing device are disposed on opposite sides of the substrate;
the display device further comprises an adhesive layer, the adhesive layer is arranged on one side, far away from the display function layer, of the substrate, the adhesive layer is provided with an opening, the opening corresponds to the fingerprint identification area, and the optical alignment structure is arranged in the opening.
6. The display device according to claim 5, further comprising a support layer between the substrate and the adhesive layer, wherein a support layer is disposed in both the fingerprint identification region and the non-fingerprint identification region.
7. A display device as claimed in claim 6, characterized in that the refractive index of the optical collimating structure is smaller than the refractive index of the support layer.
8. The display device of claim 5, further comprising a support layer positioned between the substrate and the adhesive layer, wherein the support layer is disposed in the non-fingerprint identification region.
9. A display device as claimed in claim 5, characterized in that the refractive index of the optical collimating structure is larger than the refractive index of air.
10. The display device of claim 5, wherein the substrate, the display functional layer, the adhesive layer, and the optical collimating structure are included in a display panel of the display device, the light sensing device being externally hung from the display panel.
11. The display device of claim 1, further comprising a substrate, wherein the light sensing device is disposed between the display functional layer and the substrate, and wherein the substrate, the display functional layer, the optical collimating structure, and the light sensing device are included in a display panel of the display device.
12. A display device as claimed in any one of claims 1-5 and 8-11, wherein the refractive index of the optical collimating structure is larger than the refractive index of a setting structural layer, the setting structural layer being a structural layer in contact with the optical collimating structure on a side of the optical collimating structure closer to the display functional layer.
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| US20070236631A1 (en) * | 2004-07-12 | 2007-10-11 | Fuji Photo Film Co., Ltd. | Antireflection Film, Polarizing Plate, and Image Display Device Using the Same |
| CN106940488B (en) * | 2017-04-27 | 2019-07-12 | 上海天马微电子有限公司 | Display panel and display device |
| CN107563318B (en) * | 2017-08-23 | 2020-09-08 | 上海天马微电子有限公司 | Display device and electronic equipment |
| CN108538206B (en) * | 2018-05-25 | 2021-02-09 | 武汉天马微电子有限公司 | Display panel and display device |
| CN110062931B (en) * | 2019-03-12 | 2021-07-16 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device, fingerprint identification method and electronic equipment |
| CN209447196U (en) * | 2019-03-26 | 2019-09-27 | 上海箩箕技术有限公司 | Optical fingerprint sensor mould group |
| CN109829452B (en) * | 2019-03-26 | 2024-02-27 | 上海箩箕技术有限公司 | Optical fingerprint sensor module and forming method thereof |
| CN110945527B (en) * | 2019-10-25 | 2023-09-12 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
| CN111723766B (en) * | 2020-06-29 | 2022-10-28 | 昆山国显光电有限公司 | Display module, preparation method thereof and display terminal |
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