CN110174794B - Display device, liquid crystal display panel and driving method thereof - Google Patents
Display device, liquid crystal display panel and driving method thereof Download PDFInfo
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- CN110174794B CN110174794B CN201910579069.7A CN201910579069A CN110174794B CN 110174794 B CN110174794 B CN 110174794B CN 201910579069 A CN201910579069 A CN 201910579069A CN 110174794 B CN110174794 B CN 110174794B
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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
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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Abstract
The disclosure provides a display device, a liquid crystal display panel and a driving method of the liquid crystal display panel, and relates to the technical field of display. The liquid crystal display panel comprises a display module, a backlight module, a light guide layer, an identification light source and an identification light induction circuit. The display module comprises a liquid crystal layer and a color film layer positioned on one side of the liquid crystal layer, wherein the color film layer comprises a plurality of light filtering areas, and the light filtering areas are provided with a plurality of light holes for transmitting identification light; the backlight module is arranged on the backlight side of the display module; the light guide layer is provided with a contact surface and a back surface which are opposite to each other, and the back surface faces the display module; the identification light source is used for emitting identification light rays into the light guide layer, the identification light rays are invisible light or visible light with the color different from that of each filter area, and at least part of the identification light rays entering the light guide layer can be totally reflected between the back surface and the contact surface; discernment light response circuit locates one side back of the body with the leaded light layer of various rete for the discernment light of response discernment light source generates fingerprint signal.
Description
Technical Field
The disclosure relates to the technical field of display, in particular to a display device, a liquid crystal display panel and a driving method of the liquid crystal display panel.
Background
At present, the technology of implementing fingerprint identification on a display panel is widely applied, wherein the display panel with the fingerprint identification function is usually an OLED (Organic Light-Emitting Diode) display panel, and Light emitted by an Organic Light-Emitting layer is reflected by a fingerprint and then reaches a fingerprint identification device through a small hole on a Light shielding layer located on a side of the Organic Light-Emitting layer away from a finger, so as to obtain fingerprint information. However, in the liquid crystal display panel, if a light shielding layer having small holes is disposed in the liquid crystal display panel, the light shielding layer blocks light of the backlight module, and thus it is difficult to display an image, which makes it difficult to apply the fingerprint recognition technology to the liquid crystal display panel.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The present disclosure is directed to overcome the above-mentioned deficiencies in the prior art, and provides a display device, a liquid crystal display panel and a driving method of the liquid crystal display panel, which can realize fingerprint recognition in the liquid crystal display panel.
According to an aspect of the present disclosure, there is provided a liquid crystal display panel including:
the display module comprises a liquid crystal layer and a color film layer positioned on one side of the liquid crystal layer, wherein the color film layer comprises a plurality of light filtering areas, and the light filtering areas are provided with a plurality of light holes for transmitting identification light;
the backlight module is arranged on the backlight side of the display module;
the light guide layer is provided with a contact surface and a back surface which are opposite, the back surface faces the display module, and the contact surface is used for being in contact with fingers;
the identification light source is used for emitting identification light rays into the light guide layer, the identification light rays are non-visible light rays or visible light rays with colors different from the colors of the light filtering regions, and at least part of the identification light rays entering the light guide layer can be totally reflected between the back surface and the contact surface;
the identification light ray sensing circuit is arranged on one side of the color film layer, which is opposite to the light guide layer, corresponds to the plurality of light holes, and is used for sensing identification light rays of the identification light source and generating a fingerprint signal; the identification light ray sensing circuit is of a transparent structure and comprises a sensing unit, and if the light ray emitted by the identification light source is invisible light, the sensing unit is a invisible light sensing unit; if the light emitted by the identification light source is visible light with a color different from that of the filter area, the sensing unit is a visible light sensing unit;
the identification light reflected by the finger can reach the identification light sensing circuit through the light transmission hole to form a fingerprint image on the identification light sensing circuit.
In an exemplary embodiment of the disclosure, each of the light holes is opened in one of the filter regions.
In an exemplary embodiment of the disclosure, the area of the cross section of the light-transmitting hole is not more than one fifth of the area of the filter region where the light-transmitting hole is located.
In an exemplary embodiment of the disclosure, the ranges of the finger reflected light received by two adjacent light-transmitting holes on the contact surface are at least partially overlapped; the ranges of the light rays transmitted by the two adjacent light holes on the identification light ray induction circuit are not coincident with each other.
In an exemplary embodiment of the present disclosure, a ratio of a distance between the contact surface and a middle cross-section of the light-transmitting hole to a distance between the recognition light sensing circuit and the middle cross-section of the light-transmitting hole is not less than
In an exemplary embodiment of the present disclosure, the identification light emitted by the identification light source is infrared light, and the sensing unit is an infrared sensing unit.
In an exemplary embodiment of the present disclosure, the backlight module is a direct type backlight module or a side type backlight module;
if the backlight module is a direct type backlight module, the backlight module comprises a plurality of backlight sources facing the display module, and at least part of the backlight sources correspond to the light ray identification sensing circuit; the backlight source corresponding to the identification light sensing circuit emits light with a first luminous intensity, and the backlight source corresponding to the area outside the identification light sensing circuit emits light with a second luminous intensity; the product of the first luminous intensity and the light transmittance of the identification light sensing circuit is equal to the second luminous intensity;
if the backlight module is a side-in type backlight module, the backlight module comprises a light guide plate, the light guide plate is provided with a light-emitting surface and a backlight surface which are opposite, the light-emitting surface faces the display module, and the backlight surface is provided with reflective mesh points; the density of the mesh points of the backlight surface corresponding to the area of the identification light sensing circuit is a first density, and the density of the mesh points of the backlight surface corresponding to the area outside the identification light sensing circuit is a second density; the first density is greater than the second density.
In an exemplary embodiment of the present disclosure, the liquid crystal display panel further includes:
the touch control module is arranged on one side, facing the display module, of the light guide layer and used for judging the touch control position of the finger and controlling the identification light sensing circuit to generate a fingerprint signal according to the received identification light when the touch control position corresponds to the area of the identification light sensing circuit.
According to an aspect of the present disclosure, there is provided a driving method of a liquid crystal display panel for the liquid crystal display panel of any one of the above,
if the light emitted by the identification light source is visible light, the sensing unit is a visible light sensing unit, and the driving method includes:
in the fingerprint identification period:
the identification light source is turned on, identification light rays are emitted to the light guide layer, and at least the light source of the backlight module corresponding to the identification light ray sensing circuit is turned off;
controlling the sensing unit to generate a fingerprint signal according to the received identification light;
in the display period:
turning off the identification light source and turning on the backlight module; or
If the identification light emitted by the identification light source is invisible light, the sensing unit is a non-visible light sensing unit, and the driving method comprises the following steps:
controlling the identification light source to emit identification light to the light guide layer;
and controlling the sensing unit to generate a fingerprint signal according to the received identification light.
In an exemplary embodiment of the present disclosure, the liquid crystal display panel further includes:
the touch module is arranged on one side, facing the backlight module, of the light guide layer;
if the identification light emitted by the identification light source is visible light, the driving method further comprises:
and judging the touch position of the finger, and entering the fingerprint identification time interval when the touch position corresponds to the identification light sensing circuit.
According to an aspect of the present disclosure, there is provided a display device including the liquid crystal display panel described in any one of the above.
In an exemplary embodiment of the present disclosure, the display module is provided with a mounting hole penetrating in a direction perpendicular to the contact surface, and the identification light source is disposed in the mounting hole;
the display device further includes:
and the camera shooting module is arranged in the mounting hole.
If the identification light emitted by the identification light source is visible light and the sensing unit of the identification light sensing circuit is a visible light sensing unit, the identification light source can be turned off and the backlight module can be turned on when an image is displayed, and the identification light sensing circuit cannot shield the light emitted by the backlight module, so that the image can be normally displayed. When fingerprint identification is carried out, at least the light source corresponding to the backlight module and the identification light sensing circuit can be closed, so that the backlight module can not emit light to the identification light sensing circuit and the identification light source emits light to the light guide layer; when the finger does not press the area that the contact layer corresponds to discernment light response circuit, the intraformational light of leaded light takes place the total reflection at contact surface and back, when the finger presses the contact layer and corresponds to discernment light response circuit's area, the total reflection condition in this area is destroyed, make light can follow this area and penetrate to the finger and by the finger reflection, when the back on leaded light layer is shone to the light that is reflected by the finger, the incident angle of at least part light does not satisfy the total reflection condition, and different with the colour in filter zone, thereby the light trap of accessible color film layer shines to discernment light response circuit, according to the principle of aperture formation of image, form fingerprint image on discernment light response circuit, so that sensing element generates fingerprint signal. Thus, fingerprint recognition can be performed on the liquid crystal display panel.
If the discernment light that the discernment light source sent is non-visible light, the response unit is non-visible light sensing unit, then when showing image or fingerprint identification, need not close discernment light source and backlight unit, the light that the discernment light source sent can't pass through the filter zone, and can only shine to discernment light induction circuit through the light trap, according to the principle of aperture formation of image, form the fingerprint image on discernment light induction circuit, the response unit can be according to the non-visible light received and produce the fingerprint signal, thereby can be when showing the image, carry out fingerprint identification.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
Fig. 1 is a schematic diagram of a liquid crystal display panel according to an embodiment of the present disclosure when not in contact with a finger.
Fig. 2 is a schematic diagram of a liquid crystal display panel according to an embodiment of the present disclosure when being contacted with a finger.
Fig. 3 is a schematic diagram of a liquid crystal display panel according to an embodiment of the present disclosure during a display period.
Fig. 4 is a schematic view illustrating a mounting hole formed in a display module of a liquid crystal display panel according to an embodiment of the disclosure.
Fig. 5 is a schematic view illustrating a dot distribution of a light guide plate of a lateral backlight module of a liquid crystal display panel according to an embodiment of the disclosure.
Fig. 6 is a schematic distribution diagram of a backlight source of a direct-type backlight module of a liquid crystal display panel according to an embodiment of the disclosure.
Description of reference numerals:
1. a display module; 11. a color film layer; 111. a light filtering area; 101. mounting holes; 112. a black matrix; 1101. a light-transmitting hole; 12. a liquid crystal layer; 13. an array substrate; 14. a color film substrate; 141. a second substrate; 2. a backlight module; 21. a light guide plate; 22. a backlight source; 3. a light guide layer; 31. a contact surface; 32. a light incident surface; 4. identifying a light source; 5. a light ray sensing circuit is identified; 6. a first polarizer; 7. a second polarizer; 8. a touch module; 100. the camera module.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.
Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be understood that if the illustrated device is turned upside down, elements described as "upper" will be those that are "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.
The terms "a," "an," "the," "said," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first" and "second" are used merely as labels, and are not limiting on the number of their objects.
The disclosed embodiment provides a liquid crystal display panel, as shown in fig. 1-3, the liquid crystal display panel includes a display module 1, a backlight module 2, a light guide layer 3, an identification light source 4 and an identification light induction circuit 5, wherein:
the display module 1 includes a color film layer 11, the color film layer 11 includes a plurality of filter regions 111, the filter regions 111 can allow light waves with specified wavelengths to pass through, but colors of different filter regions 111 can be different, and a plurality of light holes 1101 for passing through identification light are disposed in the filter regions 111, but not limited to the light holes 1101 being all located in the same filter region 111. The backlight module 2 is disposed on the backlight side of the display module 1. The light guide layer 3 has a contact surface 31 and a back surface which are opposite to each other, the back surface is arranged towards the display module 1, and the contact surface 31 is used for being in contact with fingers.
The identification light source 4 is arranged towards the light guide layer 3 and is used for emitting identification light rays into the light guide layer 3, wherein the identification light rays are non-visible light rays or visible light rays with colors different from the color of the filter area 111; at least part of the identification light entering the light guiding layer 3 can be totally reflected between the back surface and the contact surface 31.
The identification light sensing circuit 5 is arranged on one side of the color film layer 11, which is back to the light guide layer 3, and corresponds to the plurality of light holes 1101, and identification light reflected by a finger can penetrate through the light holes 1101 so as to form a fingerprint image on the identification light sensing circuit 5. The identification light sensing circuit 5 is of a transparent structure and includes a sensing unit, and if the identification light emitted by the identification light source 4 is invisible light, the sensing unit is a invisible light sensing unit and can perform photoelectric sensing on the invisible light emitted by the identification light source 4 to generate a fingerprint signal. If the identification light emitted by the identification light source 4 is visible light with a color different from that of the filter region 111, the sensing unit is a visible light sensing unit, and can perform photoelectric sensing on the invisible light emitted by the identification light source 4 to generate a fingerprint signal.
As shown in fig. 3, if the identification light emitted from the identification light source 4 is visible light, the sensing unit of the identification light sensing circuit 5 is a visible light sensing unit. When displaying an image, the recognition light source 4 can be turned off, and the backlight module 2 can be turned on, so as to display the image. When fingerprint identification is carried out, at least the light source corresponding to the backlight module 2 and the identification light sensing circuit 5 can be closed, and identification light is emitted into the light guide layer 3 by the identification light source 4; as shown in fig. 1, when a finger is not in contact with the area of the contact surface 31 corresponding to the identification light sensing circuit 5, at least part of the identification light in the light guide layer 3 is totally reflected between the contact surface 31 and the back surface; as shown in fig. 2, when a finger contacts a region of the contact surface 31 corresponding to the identification light sensing circuit 5, the total reflection condition of the region is destroyed, so that the identification light can be emitted from the region to the finger and reflected by the finger, and when the identification light reflected by the finger is irradiated to the back surface of the light guide layer 3, the incident angle of at least part of the light does not satisfy the total reflection condition, so that the light can be irradiated to the identification light sensing circuit 5 through the light hole 1101 of the color film layer 11, and a fingerprint image is formed on the identification light sensing circuit 5 according to the principle of pinhole imaging, so that the sensing unit generates a fingerprint signal. Thus, fingerprint recognition can be performed on the liquid crystal display panel.
If the discernment light that discernment light source 4 sent is non-visible light, the induction element is non-visible light induction element, then when display image or fingerprint identification, need not close discernment light source 4 and backlight unit 2, the light that discernment light source 4 sent can't pass through filter zone 111, and can only shine to discernment light induction circuit 5 through light trap 1101, according to the principle of aperture formation of image, form the fingerprint image on discernment light induction circuit 5, the induction element can be according to the non-visible light received and produce the fingerprint signal, thereby can be when displaying the image, carry out fingerprint identification.
The following describes each part of the liquid crystal display panel according to the embodiment of the present disclosure in detail:
as shown in fig. 1-3, the display module 1 includes a color film layer 11, the color film layer 11 includes a plurality of filter regions 111 distributed in an array, each filter region 111 can only transmit light with a specific wavelength, but the colors of different filter regions 111 can be different; the color film layer 11 further includes an opaque black matrix 112, the black matrix 112 can separate each of the filter regions 111, wherein the liquid crystal display panel has a plurality of pixels, each of the pixels has a plurality of sub-pixels, each of the filter regions 111 can correspond to the plurality of sub-pixels one by one, and the color of the filter region 111 corresponding to each of the sub-pixels of the same pixel is different. For example: each pixel has three sub-pixels, and the colors of the filter regions 111 corresponding to the sub-pixels of each pixel are red (R), green (G), and blue (B), respectively.
At least a part of the filter region 111 is provided with a plurality of light holes 1101, the number of the light holes 1101 is multiple, and the light holes 1101 correspond to the identification light sensing circuit 5, that is, the orthographic projection of the light holes 1101 on the plane where the identification light sensing circuit 5 is located in the identification light sensing circuit 5. Meanwhile, each filter region 111 is provided with at most one light hole 1101, that is, any filter region 111 may be provided with one light hole 1101 or without the light holes 1101. Furthermore, at most one filter region 111 of any two adjacent filter regions 111 is provided with a light-transmitting hole 1101 to avoid an excessively short image distance.
The light-transmitting hole 1101 may be a circular hole having a diameter such that small hole imaging can be performed on the identification light sensing circuit 5, which is not particularly limited herein. Further, in order to reduce the influence of the light hole 1101 on the display effect, the area of the cross section of the light hole 1101 may be not larger than one fifth of the area of the filter region 111 where the light hole 1101 is located, or may be smaller, as long as pinhole imaging can be achieved.
In an embodiment, as shown in fig. 1 to 3, the display module 1 includes a liquid crystal layer 12, and an array substrate 13 and a color filter substrate 14 that are disposed in a cell, where the liquid crystal layer 12 is located between the array substrate 13 and the color filter substrate 14, and the array substrate 13 includes a first substrate and a driving electrode layer located on one side of the first substrate close to the liquid crystal layer 12. The color filter substrate 14 includes the color filter layer 11 and the second substrate 141, and the color filter layer 11 is stacked on one side of the second substrate 141 close to the liquid crystal layer 12.
In another embodiment, the display module comprises a liquid crystal layer and a first substrate and a second substrate arranged on the cell, wherein the liquid crystal layer is positioned between the first substrate and the second substrate, the first substrate comprises an array substrate with a color film layer, and the color film layer is arranged between the array substrate and the liquid crystal layer.
As shown in fig. 3, the backlight module 2 is disposed on a backlight side of the display module 1, for example, a side of the array substrate 13 away from the color filter substrate 14. The backlight module 2 can emit light to the display module 1, and the light emitted by the backlight module 2 is visible light so as to display images. The backlight module 2 may be a side-in type structure. Of course, the backlight module 2 may also be a direct-type structure, and is not limited herein.
As shown in fig. 1-3, the light guide layer 3 may be a flat plate structure made of a transparent material, and has a contact surface 31 and a back surface opposite to each other, the back surface is disposed toward the display module 1, and the contact surface 31 is located on a side of the back surface away from the display module 1 and is used for contacting with a finger.
In addition, the light guide layer 3 may further include a light incident surface 32 connected between the contact surface 31 and the back surface, and the light incident surface 32 may be a plane or a curved surface, which is not particularly limited herein.
As shown in fig. 1 and 2, the identification light source 4 is used for emitting identification light into the light guide layer 3, for example, the identification light source 4 is disposed toward the light incident surface 32 of the light guide layer 3 and can emit identification light toward the light incident surface 32. The identification light can be invisible light or visible light with a color different from that of the filter region 111, so that the light emitted from the identification light source 4 can only pass through the light-transmitting hole 1101 and irradiate the identification light sensing circuit 5, but not pass through the filter region 111.
In one embodiment, the identification light source 4 can emit non-visible light, such as infrared light. In another embodiment, the identification light source 4 can emit visible light, which is monochromatic light with a color different from that of the filter region 111, for example, the colors of the three filter regions 111 corresponding to the three sub-pixels of the same pixel are red, green and blue, respectively, and the color of the light emitted by the identification light source 4 can be yellow, purple, etc.
Meanwhile, no matter whether the light emitted by the identification light source 4 is visible light or invisible light, at least part of the light emitted by the identification light source 4 entering the light guide layer 3 can be totally reflected between the back surface of the light guide layer 3 and the contact surface 31, and under the condition that the total reflection condition is not damaged, for example, under the condition that media on two sides of the light guide layer 3 are not changed, at least part of the identification light source 4 can be prevented from being emitted from the contact surface 31 or the back surface. In order to satisfy the total reflection condition, the contact surface 31 may be in contact with air, and the refractive index of the light guide layer 3 is greater than that of air; the refractive index of the display module 1 or other film layers contacting with the back surface of the light guide layer 3 is smaller than that of the light guide layer 3. As shown in fig. 2, when the user's finger presses the contact surface 31, the air in the pressing area a is discharged, the total reflection condition of the pressing area a is broken, and thus the light may be emitted from the pressing area a and irradiated onto the finger and reflected by the finger.
As shown in fig. 1 and 2, the identification light sensing circuit 5 is disposed between the backlight module 2 and the display module 1, and each light hole 1101 of the identification area is opposite to the identification light sensing circuit 5, that is, the orthographic projection of the light hole 1101 on the plane where the identification light sensing circuit 5 is located in the identification light sensing circuit 5. The light ray sensing circuit 5 is a transparent structure, so that the light rays emitted by the backlight module 2 can be prevented from being shielded.
It should be noted that, if the backlight module 2 is a side-in type backlight module and includes a light source and a light guide plate, the identification light sensing circuit 5 may be located between the light guide plate and the display module 1, and one or more layers of optical films may be disposed between the identification light sensing circuit 5 and the display module 1. If backlight unit 2 is straight following formula backlight unit, discernment light induction circuit 5 can be between light source and display module assembly 1, still can set up one deck or multilayer optical film piece between discernment light induction circuit 5 and the display module assembly 1.
The identification light sensing circuit 5 is a transparent structure, which is not limited to be completely transparent, and may be translucent or partially transparent, but if the transparent structure is partially transparent, the range of the transparent area should satisfy the requirement of identifying the fingerprint image, for example, the range of the transparent area is greater than 80% of the entire range of the identification light sensing circuit 5, and the like, and is not limited herein.
The identification light sensing circuit 5 may be an independent integrated circuit chip, or may be a circuit integrated in the display module 1, for example, integrated on the same circuit board as the pixel driving circuit of the array substrate of the display module 1, or the identification light sensing circuit 5 may be a circuit independent from the display module 1.
As shown in fig. 1 and 2, according to the principle of pinhole imaging, the light reflected by the finger and transmitted by the light hole 1101 forms a fingerprint image on the identification light sensing circuit 5, and the identification light sensing circuit 5 can perform photoelectric conversion, so as to obtain an electrical signal capable of reflecting fingerprint information, i.e. a fingerprint signal, according to the light reflected by the finger, and the specific sensing principle is not described in detail herein. The identification light sensing circuit 5 may include a plurality of sensing units distributed in an array to respectively receive the identification light transmitted through each light hole 1101, and the sensing units may generate a fingerprint signal according to the received light.
If the identification light emitted by the identification light source 4 is invisible light, the sensing unit is sensitive to the invisible light; for example, if the light emitted from the light source 4 is infrared light, the sensing unit is an infrared sensing unit. In addition, if the light emitted from the identification light source 4 is visible light, the sensing unit is sensitive to visible light.
Since the light sensing circuit 5 may cause light loss, in order to improve the uniformity of the brightness of the lcd panel, in one embodiment, the backlight module 2 is a side-in type backlight module, and includes a backlight source and a light guide plate 21, the light guide plate 21 has a light emitting surface and a backlight surface opposite to each other, the light emitting surface is disposed opposite to the display module 1, the backlight surface is located on one side of the light emitting surface away from the display module 1, and the backlight surface has a plurality of reflective dots.
As shown in fig. 5, the area of the backlight surface of the light guide plate 21 corresponding to the recognition light sensing circuit 5 is a first area S1, the density of the dots of the first area S1 is a first density, the area of the backlight surface corresponding to the area other than the recognition light sensing circuit 5 is a second area S2, and the density of the dots of the second area S2 is a second density. The first density may be made greater than the second density, thereby improving the brightness of the area of the light guide plate 21 corresponding to the recognition light sensing circuit 5, compensating for the loss caused by the recognition light sensing circuit 5, and improving the uniformity of the brightness of the liquid crystal display panel.
In another embodiment, as shown in fig. 6, the backlight module 2 is a direct-type backlight module, and includes a plurality of backlights 22 facing the display module 1, and at least a portion of the backlights 22 correspond to the light-identifying sensing circuit 5. The area facing the recognition light sensing circuit 5 is the first area S1, the backlight 22 in the first area S1 emits light with the first light emission intensity, the area facing the area outside the recognition light sensing circuit 5 is the second area S2, and the backlight 22 in the second area S2 emits light with the second light emission intensity. The product of the first luminous intensity and the light transmittance of the identification light sensing circuit 5 is equal to the second luminous intensity, so that the loss caused by the identification light sensing circuit 5 is compensated, and the uniformity of the brightness of the liquid crystal display panel is improved.
As shown in fig. 1 and fig. 2, in order to improve the recognition accuracy, the ranges of the reflected light of the finger received by two adjacent light-transmitting holes 1101 on the contact surface 31 may be at least partially overlapped, so that the recognition light sensing circuit 5 may receive the light reflected by each area of the finger, and the missing fingerprint scanning is avoided. Meanwhile, the light rays penetrating through two adjacent light holes 1101 are spaced from each other in the range of the identification light ray sensing circuit 5, namely, the light rays penetrating through two adjacent light holes 1101 do not have overlapping areas in the irradiation range of the identification light ray sensing circuit 5 on the surface close to the color film layer 11, so that the fingerprint information is prevented from being interfered, and the accuracy of fingerprint identification is ensured.
Further, the area of the corresponding range of the finger reflected light received by any of the light-transmitting holes 1101 on the contact surface 31 is larger than the area of the range of the light transmitted by the light-transmitting holes 1101 on the identification light sensing circuit 5, i.e., S > L in fig. 1 and 2.
The ratio of the distance between the contact surface 31 of the light guide layer 3 and the middle cross section of the light transmission hole 1101 to the distance between the identification light sensing circuit 5 and the middle cross section of the light transmission hole 1101 is not less than
The middle cross section of the light hole 1101 is a cross section having an equal distance from both ends of the light hole 1101.
As shown in fig. 1 to 3, the liquid crystal display panel of the present disclosure further includes a first polarizer 6 and a second polarizer 7, a direction of an absorption axis of the first polarizer 6 is different from a direction of an absorption axis of the second polarizer 7, wherein:
the first polarizer 6 is arranged on one side of the backlight module 2 facing the display module 1, for example, between the identification light sensing circuit 5 and the backlight module 2, or between the identification light sensing circuit 5 and the display module 1; the second polarizer 7 is arranged between the display module 1 and the light guide layer 3. The first polarizer 6 is used for converting the light beam generated by the backlight module 2 into polarized light, and the second polarizer 7 is used for analyzing the polarized light modulated by the liquid crystal layer 12 so as to display images, and the specific principle is not described in detail herein.
The lcd panel of the present disclosure may further include a touch module 8 disposed on one side of the light guiding layer 3 facing the display module 1, for example, between the light guiding layer 3 and the second polarizer 7, for determining a touch position of a finger, and controlling the recognition light sensing circuit 5 to generate a fingerprint signal according to the received recognition light when the touch position corresponds to a region of the recognition light sensing circuit 5. The touch module 8 may include a first touch electrode, an insulating layer, and a second touch electrode stacked in sequence, and the specific structure is not particularly limited.
The embodiments of the present disclosure further provide a driving method for a liquid crystal display panel, which is used for the liquid crystal display panel of the above embodiments, and a detailed structure of the liquid crystal display panel is not described in detail herein.
If the light emitted by the light source is identified as visible light and the sensing unit is a visible light sensing unit, the driving method of the embodiment of the disclosure includes:
in the fingerprint identification period:
the identification light source is started, light rays are emitted to the light incident surface, and at least the light source of the backlight module corresponding to the identification light ray sensing circuit is closed;
controlling the sensing unit to generate a fingerprint signal according to the received light;
in the display period:
and closing the identification light source and opening the backlight module.
If the light emitted by the light source is identified to be invisible light and the sensing unit is a non-visible light sensing unit, the driving method of the embodiment of the disclosure includes:
controlling the identification light source to emit light rays to the light incident surface;
and controlling the sensing unit to generate a fingerprint signal according to the received light.
In the driving method according to the embodiment of the disclosure, as shown in fig. 1 and 2, if the identification light emitted by the identification light source is visible light, the sensing unit is a visible light sensing unit, and in the fingerprint identification period, the backlight module does not emit light, and the identification light source emits light. At this time, if the identification light sensing circuit 5 is located between the first polarizer 6 and the backlight module 2, the liquid crystal layer 12 may be controlled to adjust the polarization state of the light corresponding to the region of the sensing unit, so that the light reflected by the finger can pass through the first polarizer 6 and reach the sensing unit, and in order to reduce the consumption of the liquid crystal layer 12 to the light, the region of the liquid crystal layer 12 corresponding to the identification light sensing circuit 5 may be in a state of completely transmitting the light reflected by the finger; if the identification light sensing circuit 5 is located between the first polarizer 6 and the display module 1, the liquid crystal layer 12 may not be adjusted, and the light reflected by the finger may directly reach the sensing unit through the liquid crystal layer 12.
In the above process, the liquid crystal display panel does not display an image, but is only used for fingerprint identification; as shown in fig. 3, in the display period, the backlight module 2 emits light, and the identification light source 4 does not emit light, and at this time, the liquid crystal display panel can display an image without performing fingerprint identification. Thus, fingerprint recognition can be realized on the liquid crystal display panel.
If the identification light emitted by the identification light source is invisible light and the sensing unit is a non-visible light sensing unit, the liquid crystal display panel can display images and simultaneously realize fingerprint identification. Of course, the backlight module can be closed during fingerprint identification.
For the liquid crystal display panel having the touch module 8, the structure and the position of the touch module 8 may refer to the touch module 8 in the above, which is not described herein again, and based on this, the driving method further includes:
and judging the touch position of the finger, and entering the fingerprint identification time period when the touch position is located in the identification area.
Moreover, although the steps of the methods of the present disclosure are depicted in the drawings in a particular order, this does not require or imply that the steps must be performed in this particular order, or that all of the depicted steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.
According to an aspect of the present disclosure, embodiments of the present disclosure also provide a display device, which may be used in a mobile phone, a tablet computer, or other terminal devices, which are not listed here. Meanwhile, the display device comprises the liquid crystal display panel of the above embodiment, and the structure of the liquid crystal display panel and the beneficial effects of the display device are not described in detail herein.
In addition, as shown in fig. 4, the display module 1 is provided with a mounting hole 101 penetrating through the display module 1, and the mounting hole 101 may extend in a direction perpendicular to the contact surface 31. The recognition light source 4 is located in the mounting hole 101, and the camera module 100 can be arranged in the mounting hole 101. And the orthographic projections of the identification light source 4 and the camera module 100 on the contact surface 31 are not overlapped, so that the identification light source 4 is prevented from blocking the camera module 100 to shoot images. Therefore, the space for placing the camera module 100 can be utilized to place the identification light source 4, and the space is saved.
The shape of the installation hole 101 may be circular, rectangular or other closed shapes, or the installation hole 101 may also be opened at the edge of the light guide layer 3, and its cross section may be in an unclosed shape such as U-shape, semicircular shape, etc. The identification light source 4 may emit light toward the light guide layer 3.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (12)
1. A liquid crystal display panel, comprising:
the display module comprises a liquid crystal layer and a color film layer positioned on one side of the liquid crystal layer, wherein the color film layer comprises a plurality of light filtering areas, and the light filtering areas are provided with a plurality of light holes for transmitting identification light;
the backlight module is arranged on the backlight side of the display module;
the light guide layer is provided with a contact surface and a back surface which are opposite, the back surface faces the display module, and the contact surface is used for being in contact with fingers;
the identification light source is used for emitting identification light rays into the light guide layer, the identification light rays are non-visible light rays or visible light rays with colors different from the colors of the filter areas, the identification light rays cannot pass through the filter areas but only pass through the light transmission holes, and at least part of the identification light rays entering the light guide layer can be totally reflected between the back surface and the contact surface;
the identification light ray sensing circuit is arranged on one side of the color film layer, which is opposite to the light guide layer, corresponds to the plurality of light holes, and is used for sensing identification light rays of the identification light source and generating a fingerprint signal; the identification light ray sensing circuit is of a transparent structure and comprises a sensing unit, and if the light ray emitted by the identification light source is invisible light, the sensing unit is a invisible light sensing unit; if the light emitted by the identification light source is visible light with a color different from that of the filter area, the sensing unit is a visible light sensing unit;
the identification light reflected by the finger can reach the identification light sensing circuit through the light transmission hole to form a fingerprint image on the identification light sensing circuit.
2. The LCD panel of claim 1, wherein each light hole is opened in one of the filter regions.
3. The liquid crystal display panel of claim 2, wherein the area of the cross section of the light hole is not larger than one fifth of the area of the filter region.
4. The liquid crystal display panel according to claim 1, wherein the ranges of the finger-reflected light received by two adjacent light-transmitting holes on the contact surface at least partially overlap; the ranges of the light rays transmitted by the two adjacent light holes on the identification light ray induction circuit are not coincident with each other.
5. The liquid crystal display panel according to claim 1, wherein a ratio of a distance between the contact surface and a middle cross section of the light-transmitting hole to a distance between the identification light sensing circuit and the middle cross section of the light-transmitting hole is not less than
6. The liquid crystal display panel according to claim 1, wherein the identification light emitted from the identification light source is infrared light, and the sensing unit is an infrared sensing unit.
7. The liquid crystal display panel of claim 1, wherein the backlight module is a direct-type backlight module or a side-type backlight module;
if the backlight module is a direct type backlight module, the backlight module comprises a plurality of backlight sources facing the display module, and at least part of the backlight sources correspond to the light ray identification sensing circuit; the backlight source corresponding to the identification light sensing circuit emits light with a first luminous intensity, and the backlight source corresponding to the area outside the identification light sensing circuit emits light with a second luminous intensity; the product of the first luminous intensity and the light transmittance of the identification light sensing circuit is equal to the second luminous intensity;
if the backlight module is a side-in type backlight module, the backlight module comprises a light guide plate, the light guide plate is provided with a light-emitting surface and a backlight surface which are opposite, the light-emitting surface faces the display module, and the backlight surface is provided with reflective mesh points; the density of the mesh points of the backlight surface corresponding to the area of the identification light sensing circuit is a first density, and the density of the mesh points of the backlight surface corresponding to the area outside the identification light sensing circuit is a second density; the first density is greater than the second density.
8. The liquid crystal display panel according to claim 1, further comprising:
the touch control module is arranged on one side, facing the display module, of the light guide layer and used for judging the touch control position of the finger and controlling the identification light sensing circuit to generate a fingerprint signal according to the received identification light when the touch control position corresponds to the area of the identification light sensing circuit.
9. A driving method of a liquid crystal display panel for the liquid crystal display panel according to any one of claims 1 to 7,
if the light emitted by the identification light source is visible light, the sensing unit is a visible light sensing unit, and the driving method includes:
in the fingerprint identification period:
the identification light source is turned on, identification light rays are emitted to the light guide layer, and at least the light source of the backlight module corresponding to the identification light ray sensing circuit is turned off;
controlling the sensing unit to generate a fingerprint signal according to the received identification light;
in the display period:
turning off the identification light source and turning on the backlight module; or
If the identification light emitted by the identification light source is invisible light, the sensing unit is a non-visible light sensing unit, and the driving method comprises the following steps:
controlling the identification light source to emit identification light to the light guide layer;
and controlling the sensing unit to generate a fingerprint signal according to the received identification light.
10. The driving method according to claim 9, wherein the liquid crystal display panel further comprises:
the touch module is arranged on one side, facing the backlight module, of the light guide layer;
if the identification light emitted by the identification light source is visible light, the driving method further comprises:
and judging the touch position of the finger, and entering the fingerprint identification time interval when the touch position corresponds to the identification light sensing circuit.
11. A display device comprising the liquid crystal display panel according to any one of claims 1 to 8.
12. The display device according to claim 11, wherein the display module is provided with a mounting hole penetrating in a direction perpendicular to the contact surface, and the identification light source is arranged in the mounting hole;
the display device further includes:
the camera module is arranged in the mounting hole.
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| CN110647861B (en) * | 2019-09-29 | 2022-06-03 | 京东方科技集团股份有限公司 | Liquid crystal display panel and display device |
| CN110928022B (en) * | 2019-11-26 | 2022-11-08 | 武汉华星光电技术有限公司 | Liquid crystal box and liquid crystal display screen |
| CN111090184A (en) * | 2019-12-20 | 2020-05-01 | 维沃移动通信有限公司 | Screen assembly and electronic equipment |
| CN111025740B (en) * | 2019-12-31 | 2022-05-27 | 厦门天马微电子有限公司 | Display panel and display device |
| CN111242012B (en) | 2020-01-10 | 2024-05-10 | 京东方科技集团股份有限公司 | Display device with fingerprint identification function |
| CN111505883B (en) * | 2020-04-09 | 2023-08-08 | 青岛海信移动通信技术有限公司 | Mobile terminal |
| CN111507280B (en) * | 2020-04-21 | 2024-04-16 | 京东方科技集团股份有限公司 | Display panel and display device |
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