CN109376715B - Array substrate and display panel - Google Patents
Array substrate and display panel Download PDFInfo
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- CN109376715B CN109376715B CN201811527131.XA CN201811527131A CN109376715B CN 109376715 B CN109376715 B CN 109376715B CN 201811527131 A CN201811527131 A CN 201811527131A CN 109376715 B CN109376715 B CN 109376715B
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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
Abstract
The invention discloses an array substrate and a display panel, and relates to the technical field of display, wherein the array substrate comprises a substrate base plate, a plurality of fingerprint identification units arranged in an array manner, a plurality of fingerprint signal lines extending along a first direction, and a fingerprint identification signal receiving unit; the fingerprint identification unit at least comprises a first fingerprint identification unit and a second fingerprint identification unit, and the first fingerprint identification unit is positioned on one side of the second fingerprint identification unit, which is far away from the fingerprint identification signal receiving unit, along the first direction; the detection voltage that first fingerprint identification unit sent to the fingerprint signal line is that first voltage is greater than the detection voltage that second fingerprint identification unit sent to the fingerprint signal line and is the second voltage. The invention can improve the strength of the detection signal of the first fingerprint identification unit, so that the detection signals of the fingerprint identification units with different distances received by the fingerprint identification signal receiving unit are as uniform as possible, thereby improving the accuracy of fingerprint identification.
Description
Technical Field
The invention relates to the technical field of display, in particular to an array substrate and a display panel.
Background
A fingerprint is a permanent feature unique to the human body and distinguishable from others, and is composed of a series of ridges and valleys on the surface of the skin at the finger tip, the details of which typically include the branches of the ridges, the ends of the ridges, the arches, the tent arches, the left-handed, right-handed, spiral, or double-handed details, which determine the uniqueness of the fingerprint pattern. With the rapid development of display technology, display panels with fingerprint identification function have gradually spread throughout the life of people, and fingerprint identification is widely applied to display screens of electronic devices such as mobile phones, personal digital assistants, computers and the like.
At present, fingerprint identification technology and display technology combine together usually to make display panel not only have the display function, can also carry out fingerprint identification, thereby richened display panel's function, improved display panel's security performance simultaneously. Further, combine together optics fingerprint identification technique and display technology, can make the fingerprint identification region be located the display area, overcome the regional setting of fingerprint identification and account for the lower problem of ratio at the display panel's that leads to in non-display area screen, avoided the regional setting of fingerprint identification to be used for experiencing relatively poor problem that leads to when display panel's the back simultaneously.
However, in the existing fingerprint identification detection technology, due to the difference between the distances between the fingerprint identification unit and the detection end of the fingerprint identification signal, the fingerprint identification detection signal may be attenuated to different degrees in the transmission process, so that the signal detected by the detection end is not uniform, and the accuracy of fingerprint identification is poor.
Therefore, it is an urgent need to solve the technical problem of the art to provide an array substrate and a display panel with good uniformity of detected fingerprint identification signals and high fingerprint identification accuracy.
Disclosure of Invention
In view of the above, the present invention provides an array substrate and a display panel, and aims to solve the problem of poor fingerprint identification accuracy caused by non-uniform signals detected by a fingerprint identification detection terminal.
The invention provides an array substrate, comprising: the fingerprint identification device comprises a substrate base plate, a plurality of fingerprint identification units arranged in an array manner, a plurality of fingerprint signal lines extending along a first direction and a fingerprint identification signal receiving unit, wherein the fingerprint identification units are positioned on the substrate base plate; the fingerprint identification unit is electrically connected with the fingerprint identification signal receiving unit through a fingerprint signal line, one end of the fingerprint signal line is electrically connected with the fingerprint identification unit, and the other end of the fingerprint signal line is electrically connected with the fingerprint identification signal receiving unit; the fingerprint identification unit at least comprises a first fingerprint identification unit and a second fingerprint identification unit, and the first fingerprint identification unit is positioned on one side of the second fingerprint identification unit, which is far away from the fingerprint identification signal receiving unit, along the first direction; the detection voltage sent to the fingerprint signal line by the first fingerprint identification unit is a first voltage, and the detection voltage sent to the fingerprint signal line by the second fingerprint identification unit is a second voltage; wherein the first voltage is greater than the second voltage.
Based on the same idea, the invention also provides a display panel comprising the array substrate.
Compared with the prior art, the array substrate and the display panel provided by the invention at least realize the following beneficial effects:
in the invention, in the first direction, the first fingerprint identification unit is arranged at one side of the second fingerprint identification unit far away from the fingerprint identification signal receiving unit, namely the first fingerprint identification unit is a fingerprint identification unit far away from the fingerprint identification signal receiving unit, the second fingerprint identification unit is a fingerprint identification unit near to the fingerprint identification signal receiving unit, and the detection voltage sent to the fingerprint signal line by the first fingerprint identification unit is set to be larger than the detection voltage sent to the fingerprint signal line by the second fingerprint identification unit, namely the first voltage is larger than the second voltage, so that even if the first fingerprint identification unit is far away from the fingerprint identification signal receiving unit, the first voltage sent to the fingerprint signal line by the first fingerprint identification unit is attenuated more in the transmission process to the fingerprint identification signal receiving unit, but when the first fingerprint identification unit is transmitted to the fingerprint identification signal receiving unit, compare when the second voltage that sends to the fingerprint signal line with second fingerprint identification unit transmits to fingerprint identification signal receiving element, the difference of size between them is less or the same basically, can make the detection signal of the first fingerprint identification unit that fingerprint identification signal receiving element received and the detection signal of the second fingerprint identification unit that fingerprint identification signal receiving element received equal basically, thereby improved the intensity of first fingerprint identification unit detected signal, the detection signal of the different fingerprint identification units of distance that makes fingerprint identification signal receiving element receive is as homogeneous as far as possible, thereby can improve fingerprint identification's the degree of accuracy.
Of course, it is not necessary for any product in which the present invention is practiced to specifically achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic plan view illustrating an array substrate according to an embodiment of the present invention;
fig. 2 is a schematic plan view of another array substrate according to an embodiment of the present invention;
FIG. 3 is an enlarged view of a portion of the fingerprint identification unit of FIG. 2;
fig. 4 is a schematic plan view illustrating another array substrate according to an embodiment of the present invention;
fig. 5 is a schematic plan view of another array substrate according to an embodiment of the present invention;
fig. 6 is a schematic plan view illustrating another array substrate according to an embodiment of the present invention;
fig. 7 is a schematic plan view illustrating another array substrate according to an embodiment of the present invention;
fig. 8 is a schematic plan view illustrating another array substrate according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a display panel according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Referring to fig. 1, fig. 1 is a schematic plan view of an array substrate 000 according to an embodiment of the present invention, including: a substrate base plate 10 (not filled in the figure), a plurality of fingerprint identification units 20 arranged in an array on the substrate base plate 10, a plurality of fingerprint signal lines 30 extending along a first direction Y, and a fingerprint identification signal receiving unit 40; the fingerprint identification unit 20 is electrically connected with the fingerprint identification signal receiving unit 40 through a fingerprint signal line 30, one end of the fingerprint signal line 30 is electrically connected with the fingerprint identification unit 20, and the other end of the fingerprint signal line 30 is electrically connected with the fingerprint identification signal receiving unit 40;
the fingerprint identification unit 20 at least comprises a first fingerprint identification unit 201 and a second fingerprint identification unit 202, and the first fingerprint identification unit 201 is positioned on one side of the second fingerprint identification unit 202 far away from the fingerprint identification signal receiving unit 40 along the first direction Y; the detection voltage sent by the first fingerprint identification unit 201 to the fingerprint signal line 30 is a first voltage a, and the detection voltage sent by the second fingerprint identification unit 202 to the fingerprint signal line 30 is a second voltage B; the first voltage A is greater than the second voltage B.
Specifically, the array substrate 000 of this embodiment includes the substrate 10, and the substrate 10 is provided with a plurality of fingerprint identification units 20 that are array arrangement for realize the fingerprint identification function of the display panel that this array substrate 000 constitutes, it should be noted that what the fingerprint identification unit 20 of this embodiment adopted is photoelectric fingerprint identification technology, thereby can realize the fingerprint identification function of display panel display area, simple structure, easily realization has improved user experience. It should be further noted that the plurality of fingerprint identification units 20 of this embodiment may be located in the entire display area of the display panel for identifying the entire fingerprint of the display panel, or may be located only in a partial display area of the display panel (for example, located only in the lower half screen or the upper half screen of the display panel) for identifying the local fingerprint of the display panel, and the specific implementation may be designed according to the actual situation.
The working principle of the fingerprint identification unit 20 of the present embodiment is as follows: when a finger touches the display screen, the light source is reflected when it irradiates the valley line and the ridge line of the finger fingerprint, because the reflection angles of the valley line and the ridge line and the reflected light intensity are different, the light is projected onto the fingerprint identification unit 20, the fingerprint identification unit 20 transmits the received sensing signal to the fingerprint identification signal receiving unit 40 through the fingerprint signal line 30, so that the fingerprint identification signal receiving unit 40 identifies the valley line and the ridge line of the fingerprint according to the received signal, and the light source used at this time is generally the backlight source of the display panel.
Because the signal of the fingerprint identification unit 20 is transmitted through the fingerprint signal line 30, the fingerprint signal line 30 extends along the first direction Y and has one end electrically connected to the fingerprint identification signal receiving unit 40, under the condition that the fingerprint signal line 30 has a certain impedance, for the fingerprint identification unit 20 electrically connected to the fingerprint signal line 30, the sensing signals of the fingerprint identification units 20 at different positions have signal attenuation at different degrees in the process of being transmitted to the fingerprint identification signal receiving unit 40; for example, the fingerprint identification unit 20 far away from the fingerprint identification signal receiving unit 40 needs to transmit on the fingerprint signal line 30 for a longer time, so the signal attenuation is more, while the fingerprint identification unit 20 near the fingerprint identification signal receiving unit 40 has a shorter transmission time on the fingerprint signal line 30, so the signal attenuation is less, so the signal received by the fingerprint identification signal receiving unit 40 from the fingerprint identification unit 20 far away from the fingerprint identification signal receiving unit is weaker, so the fingerprint identification capability is poor, and the accuracy is reduced.
In order to solve the problem, as shown in fig. 1, in the present embodiment, in the first direction Y, the first fingerprint identification unit 201 is disposed on the side of the second fingerprint identification unit 202 away from the fingerprint identification signal receiving unit 40, that is, the first fingerprint identification unit 201 is the fingerprint identification unit 20 farther from the fingerprint identification signal receiving unit 40, and the second fingerprint identification unit 202 is the fingerprint identification unit 20 closer to the fingerprint identification signal receiving unit 40, and the detection voltage sent by the first fingerprint identification unit 201 to the fingerprint signal line 30 is set to be greater than the detection voltage sent by the second fingerprint identification unit 202 to the fingerprint signal line 30, that is, the first voltage a is greater than the second voltage B, so that the first voltage a sent by the first fingerprint identification unit 201 to the fingerprint signal line 30 is attenuated more during the transmission to the fingerprint identification signal receiving unit 40 even if the first fingerprint identification unit 201 is farther from the fingerprint identification signal receiving unit 40, however, when the voltage is transmitted to the fingerprint identification signal receiving unit 40, the difference between the two voltages is smaller or substantially the same as that when the second voltage B sent to the fingerprint signal line 30 by the second fingerprint identification unit 202 is transmitted to the fingerprint identification signal receiving unit 40, that is, the detection signal of the first fingerprint identification unit 201 received by the fingerprint identification signal receiving unit 40 is substantially the same as the detection signal of the second fingerprint identification unit 202 received by the fingerprint identification signal receiving unit 40, so that the strength of the detection signal of the first fingerprint identification unit 201 is improved, the detection signals of the fingerprint identification units 20 with different distances received by the fingerprint identification signal receiving unit 40 are as uniform as possible, and the accuracy of fingerprint identification can be improved.
It should be noted that how to realize that the detection voltage sent by the first fingerprint identification unit 201 to the fingerprint signal line 30 is greater than the detection voltage sent by the second fingerprint identification unit 202 to the fingerprint signal line 30 is not specifically limited in this embodiment, and the design of the scheme can be performed according to the actual design requirement, and it only needs to be satisfied that the detection voltage sent by the first fingerprint identification unit 201 to the fingerprint signal line 30 is greater than the detection voltage sent by the second fingerprint identification unit 202 to the fingerprint signal line 30. In this embodiment, the specific value of the first voltage a greater than the second voltage B is not limited, and in specific implementation, the value of the first voltage a greater than the second voltage B may be obtained by calculating through an actual design framework, and it is only necessary that the detection signal of the first fingerprint identification unit 201 received by the fingerprint identification signal receiving unit 40 is substantially equal to the detection signal of the second fingerprint identification unit 202 received by the fingerprint identification signal receiving unit 40.
In some optional embodiments, please refer to fig. 2 and fig. 3, fig. 2 is a schematic plan structure diagram of another array substrate according to an embodiment of the present invention, fig. 3 is a partially enlarged view of the fingerprint identification units in fig. 2, in this embodiment, the array substrate 000 further includes a plurality of fingerprint scanning lines 50 (the fingerprint scanning lines 50 of this embodiment are used for providing scanning driving signals to the fingerprint identification units 20) extending along the second direction X, the fingerprint scanning lines 50 and the fingerprint signal lines 30 are crossed and insulated to define an area where a plurality of fingerprint identification units 20 are located, and at least two fingerprint identification units 20 in the same row of fingerprint identification units 20 are electrically connected to the same fingerprint scanning line 50; wherein the second direction X intersects the first direction Y;
as shown in fig. 3, the fingerprint identification unit 20 includes a switching transistor 21 and a photodiode 22 electrically connected, the switching transistor 21 includes a gate 211, a source 212, and a drain 213, the gate 211 is electrically connected to the fingerprint scanning line 50, the source 212 is electrically connected to a cathode 221 of the photodiode 22, the drain 213 is electrically connected to the fingerprint signal line 30, an anode 222 of the photodiode 22 is connected to a bias voltage Vbias, the cathode 221 of the photodiode 22 is connected to a reference voltage Vref, the reference voltage Vref is a fixed voltage externally supplied to the cathode 221 of the photodiode 22, or the reference voltage Vref is a fixed voltage supplied to the cathode 221 of the photodiode 22 by the fingerprint signal line 30.
The present embodiment further explains the optional circuit architecture of the fingerprint identification unit 20 and the operation principle of the fingerprint identification unit 20. The fingerprint scanning line 50 is electrically connected to the gate 211 of the switching transistor 21 of the fingerprint identification unit 20, the switching transistor 21 can be activated by providing an electrical signal to the fingerprint scanning line 50, so that the fingerprint identification unit 20 is turned on line by line or at a time along the first direction Y, the negative electrode 221 of the photodiode 22 (i.e. the N-terminal of the PN junction) is charged to a level corresponding to the reference voltage Vref by the fingerprint signal line 30, then the fingerprint identification unit 20 is turned on line by providing an electrical signal to the fingerprint scanning line 50, when the photodiode 22 is illuminated, the reference voltage Vref corresponding to the negative electrode 221 of the photodiode 22 is changed, that is, when a finger contacts the screen, the light source is illuminated on the valley line and the ridge line of the fingerprint, and because the reflection angle of the valley line and the ridge line and the intensity of the reflected light are different, the light is projected onto the photodiode 22, the resistance value of the photodiode 22 is caused to change, and thereby a current is caused to change, which is transmitted to the fingerprint signal line 30 through the switching transistor 21 in a turned-on state, so that the fingerprint identification signal receiving unit 40 connected to the fingerprint signal line 30 identifies the valleys and ridges of the fingerprint.
It should be noted that the bias voltage Vbias generally refers to a dc quiescent operating point voltage of the device. Different biases have different meanings according to devices and circuits, but all mean that a direct current working state is given when no signal is input. The bias voltage Vbias applied to the anode 222 of the photodiode 22 (i.e., the P terminal of the PN junction) is a predetermined dc voltage without including the illumination current. The bias voltage Vbias of the photodiode 22 is reverse biased, i.e. no current passes in the absence of illumination. When light strikes the PN junction of the photodiode 22, a portion of the carriers cross the potential barrier formed by the reverse bias, creating a photocurrent whose magnitude is proportional to the intensity of the light. The magnitude of the bias voltage Vbias will also depend on the actual situation, but is generally greater than the forward voltage of photodiode 22 and much less than its reverse breakdown voltage. The bias voltage Vbias applied to the anode 222 of the photodiode 22 of this embodiment may be electrically connected to the driver chip through a single metal mesh, or may be electrically connected to the driver chip through an indium tin oxide semiconductor film, and an electrical signal given to the bias voltage Vbias by the driver chip may be applied. The reference voltage Vref connected to the cathode 221 of the photodiode 22 in this embodiment may be a fixed voltage externally provided to the cathode 221 of the photodiode 22, and may also be a fixed voltage provided to the cathode 221 of the photodiode 22 by the fingerprint signal line 30.
It should be further noted that the fingerprint identification unit 20 of the present embodiment further includes a first capacitor C1, the first capacitor C1 can be used as a storage capacitor, and when the fingerprint identification unit 20 performs light sensing, the first capacitor C1 and the photodiode 22 form a discharge circuit to obtain a corresponding light sensing signal. Specifically, the first capacitor C1 is disposed in parallel with the photodiode 22, that is, one end of the first capacitor C1 is electrically connected to the cathode 221 of the photodiode 22, the other end of the first capacitor C1 is electrically connected to the anode 222 of the photodiode 22, when the reference voltage Vref is transmitted to the cathode 221 of the photodiode 22, the first capacitor C1 is also charged, when the switching transistor 21 is turned off, the first capacitor C1 forms a discharge loop with the photodiode 22, and the voltage of the end of the first capacitor C1 connected to the cathode 221 of the photodiode 22 also gradually decreases. By arranging the first capacitor C1, the capacitance capacity of the fingerprint identification unit 20 is increased, so that the voltage drop speed on the cathode 221 of the photodiode 22 is reduced, an effective photosensitive signal can be acquired, and the sensing accuracy is improved.
In some optional embodiments, please refer to fig. 2, in which the fingerprint identification units 20 in the same row are electrically connected to the same fingerprint scan line 50.
This embodiment has further limited same line of fingerprint identification unit 20 and same fingerprint scanning line 50 electricity to be connected, thereby can make same line of fingerprint identification unit 20 open through the drive scanning signal that same fingerprint scanning line 50 provided, thereby can make fingerprint identification unit 20 on the array substrate 000 start in proper order row by row and carry out fingerprint identification, thereby can connect the fingerprint identification unit 20 of the same line number as far as possible fingerprint scanning line 50, when reducing the wiring, can reduce the degree of difficulty of technology process, improve the efficiency of drive scanning, save the scanning time, can also make the drive scanning signal synchronization that fingerprint identification unit 20 of same line received, can further realize the signal transmission homogeneous.
In some optional embodiments, referring to fig. 4, fig. 4 is a schematic plan view illustrating another array substrate according to an embodiment of the present invention, in which the array substrate 000 includes a plurality of fingerprint identification areas CC extending along the second direction X, each of the fingerprint identification areas CC includes at least one row of fingerprint identification cells, and the plurality of fingerprint identification areas CC includes at least a first fingerprint identification area CC1 and a second fingerprint identification area CC 2; in the first direction Y, the first fingerprint identification area CC1 is located on a side of the second fingerprint identification area CC2 away from the fingerprint identification signal receiving unit 40.
In the present embodiment, the plurality of fingerprint identification cells 20 on the array substrate 000 are further divided into regions, and each fingerprint identification region CC extends along the second direction X perpendicular to the first direction Y (extending direction of the fingerprint signal line 30), at least a first fingerprint identification region CC1 and a second fingerprint identification region CC2 with different distances from the fingerprint identification signal receiving unit 40 exist on the array substrate 000, that is, the first fingerprint identification region CC1 is located on the side of the second fingerprint identification region CC2 away from the fingerprint identification signal receiving unit 40. This implementation is through distinguishing its and fingerprint identification signal receiving unit 40 distance between with the mode of regional division with a plurality of fingerprint identification units 20 to it is different to obtain different fingerprint identification district CC signal attenuation's degree on fingerprint signal line 30, in order to carry out different fingerprint identification district CC in fingerprint identification unit 20 to the setting of the magnitude difference of the detection voltage that fingerprint signal line 30 sent, thereby realize that the fingerprint identification signal receiving unit 40 receives the purpose of detecting signal homogeneity as far as possible in the different fingerprint identification district CC of distance, improvement fingerprint identification's the degree of accuracy.
It should be noted that each fingerprint identification area CC of the present embodiment at least includes one row of fingerprint identification units 20, that is, each fingerprint identification area CC may include one row, two rows, or more than two rows of fingerprint identification units 20.
In some optional embodiments, referring to fig. 5, fig. 5 is a schematic plan view of another array substrate according to an embodiment of the present invention, in which each fingerprint identification region CC at least includes two rows of fingerprint identification units 20.
The present embodiment further illustrates another area division manner of the plurality of fingerprint identification units 20 on the array substrate 000, that is, each fingerprint identification area CC includes at least two rows of fingerprint identification units 20. Each of the fingerprint identification regions CC of the present embodiment extends along the second direction X perpendicular to the first direction Y (extending direction of the fingerprint signal lines 30), at least a first fingerprint identification region CC1 and a second fingerprint identification region CC2 with different distances from the fingerprint identification signal receiving unit 40 exist on the array substrate 000, that is, the first fingerprint identification region CC1 is located at a side of the second fingerprint identification region CC2 away from the fingerprint identification signal receiving unit 40. This implementation is through distinguishing its and fingerprint identification signal receiving unit 40 distance between with the mode of regional division with a plurality of fingerprint identification units 20 to it is different to obtain different fingerprint identification district CC signal attenuation's degree on fingerprint signal line 30, in order to carry out different fingerprint identification district CC in fingerprint identification unit 20 to the setting of the magnitude difference of the detection voltage that fingerprint signal line 30 sent, thereby realize that the fingerprint identification signal receiving unit 40 receives the purpose of detecting signal homogeneity as far as possible in the different fingerprint identification district CC of distance, improvement fingerprint identification's the degree of accuracy.
It should be noted that, in this embodiment, the detection voltages sent to the fingerprint signal lines 30 by the two rows of fingerprint identification units 20 included in each fingerprint identification area CC may be set to be the same or different, and it is only necessary to satisfy that the detection signals in the fingerprint identification areas CC with different distances received by the fingerprint identification signal receiving unit 40 are as uniform as possible. Optionally, the detection voltages sent by the fingerprint identification units 20 in all rows of each fingerprint identification area CC to the fingerprint signal line 30 are set to be the same, so that the process difficulty can be reduced, and the signal transmission efficiency can be improved.
In some optional embodiments, please continue to refer to fig. 4, in the present embodiment, the first fingerprint identification region CC1 includes a third fingerprint identification unit 203, the third fingerprint identification unit 203 includes a third photodiode 2203, an anode 22032 of the third photodiode 2203 is connected to a third bias voltage Vbias3, and a cathode 22031 of the third photodiode 2203 is connected to a third reference voltage Vref 3;
the second fingerprint identification region CC2 includes a fourth fingerprint identification cell 204, the fourth fingerprint identification cell 204 includes a fourth photodiode 2204, the anode of the fourth photodiode 22042 is connected to a fourth bias voltage Vbias4, and the cathode 22041 of the fourth photodiode 2204 is connected to a fourth reference voltage Vref 4;
the third reference voltage Vref3 is the same as the fourth reference voltage Vref4, and the third bias voltage Vbias3 is greater than the fourth bias voltage Vbias 4.
In the present embodiment, the first fingerprint identification region CC1 includes the third fingerprint identification unit 203, the second fingerprint identification region CC2 includes the fourth fingerprint identification unit 204, and since the first fingerprint identification region CC1 is located at a side of the second fingerprint identification region CC2 away from the fingerprint identification signal receiving unit 40 along the first direction Y, in order to achieve that the voltage signals received by the fingerprint identification signal receiving unit 40 are substantially the same and uniform as much as possible after the detection voltage C sent by the third fingerprint identification unit 203 to the fingerprint signal line 30 and the detection voltage D sent by the fourth fingerprint identification unit 204 to the fingerprint signal line 30 are transmitted through the fingerprint signal line 30 and undergo signal attenuation, the third reference voltage Vref3 of the third photodiode 2203 in the third fingerprint identification unit 203 is the same as the fourth reference voltage Vref4 of the fourth photodiode 2204 in the fourth fingerprint identification unit 204, the third bias voltage Vbias3 is made to be greater than the fourth bias voltage Vbias4, and the third bias voltage Vbias3 of the remote third fingerprint identification unit 203 is increased, so that the voltage difference between the two ends of the third photodiode 2203 is made to be greater than the voltage difference between the two ends of the fourth photodiode 2204, and under the same illumination condition, the photocurrent generated by the third photodiode 2203 is greater than the photocurrent generated by the fourth photodiode 2204, so that the detection voltage C sent by the third fingerprint identification unit 203 to the fingerprint signal line 30 is greater than the detection voltage D sent by the fourth fingerprint identification unit 204 to the fingerprint signal line 30, and the detection signals of the third fingerprint identification unit 203 and the fourth fingerprint identification unit 204 received by the fingerprint identification signal receiving unit 40 can be made to be as uniform as possible, thereby improving the accuracy of fingerprint identification.
It should be noted that, in the present embodiment, the first fingerprint identification area CC1 and the second fingerprint identification area CC2 only use one row of fingerprint identification units 20 as an example to explain technical solutions and beneficial effects of the present embodiment, and a person skilled in the art can understand, according to the description, that each fingerprint identification area CC at least includes two rows of fingerprint identification units 20.
In some optional embodiments, please refer to fig. 6, fig. 6 is a schematic plane structure diagram of another array substrate according to an embodiment of the present invention, in this embodiment, the first fingerprint identification area CC1 includes a fifth fingerprint identification unit 205, the fifth fingerprint identification unit 205 includes a fifth photodiode 2205, an anode 22052 of the fifth photodiode 2205 is connected to a fifth bias voltage Vbias5, and a cathode 22051 of the fifth photodiode 2205 is connected to a fifth reference voltage Vref 5;
the second fingerprint identification region CC2 includes a sixth fingerprint identification unit 206, the sixth fingerprint identification unit 206 includes a sixth photodiode 2206, the anode 22062 of the sixth photodiode 2206 is connected with a sixth bias voltage Vbias6, and the cathode 22061 of the sixth photodiode 2206 is connected with a sixth reference voltage Vref 6;
the fifth bias voltage Vbias5 is the same as the sixth bias voltage Vbias6, and the fifth reference voltage Vref5 is greater than the sixth reference voltage Vref 6.
In the case that the first fingerprint identification area CC1 of the present embodiment includes the fifth fingerprint identification unit 205, and the second fingerprint identification area CC2 includes the sixth fingerprint identification unit 206, because in the first direction Y, the first fingerprint identification area CC1 is located at the side of the second fingerprint identification area CC2 away from the fingerprint identification signal receiving unit 40, in order to achieve that the voltage signals received by the fingerprint identification signal receiving unit 40 are substantially the same and reach signal uniformity as much as possible after the detection voltage E sent by the fifth fingerprint identification unit 205 to the fingerprint signal line 30 and the detection voltage F sent by the sixth fingerprint identification unit 206 to the fingerprint signal line 30 are transmitted through the fingerprint signal line 30 and undergo signal attenuation, the fifth bias voltage Vbias5 of the fifth photodiode 2205 in the fifth fingerprint identification unit 205 is the same as the sixth bias voltage Vbias6 of the sixth photodiode 2206 in the sixth fingerprint identification unit 206, the fifth reference voltage Vref5 is made to be greater than the sixth reference voltage Vref6, and the fifth reference voltage Vref5 of the remote fifth fingerprint identification unit 205 is increased, so that the voltage difference between the two ends of the fifth photodiode 2205 is greater than the voltage difference between the two ends of the sixth photodiode 2206, and under the same illumination condition, the photocurrent generated by the fifth photodiode 2205 is greater than the photocurrent generated by the sixth photodiode 2206, so that the detection voltage E sent by the fifth fingerprint identification unit 205 to the fingerprint signal line 30 is greater than the detection voltage F sent by the sixth fingerprint identification unit 206 to the fingerprint signal line 30, and therefore the detection signals of the fifth fingerprint identification unit 205 and the sixth fingerprint identification unit 206 received by the fingerprint identification signal receiving unit 40 can be made to be as uniform as possible, and the accuracy of fingerprint identification can be improved.
It should be noted that, in the present embodiment, the first fingerprint identification area CC1 and the second fingerprint identification area CC2 only use one row of fingerprint identification units 20 as an example to explain technical solutions and beneficial effects of the present embodiment, and a person skilled in the art can understand, according to the description, that each fingerprint identification area CC at least includes two rows of fingerprint identification units 20.
In some optional embodiments, please refer to fig. 7, fig. 7 is a schematic plan view illustrating another array substrate according to an embodiment of the present invention, in which the array substrate 000 further includes a plurality of scan lines G, a plurality of data lines S, and a plurality of pixel units 60, each pixel unit 60 includes a plurality of sub-pixels 601 and at least one fingerprint identification unit 20, and the scan lines G and the data lines S are crossed and insulated to define a region where the plurality of sub-pixels 601 are located;
a plurality of pixel groups DD extending in the direction of the scanning line G, each pixel group DD having the same area of forward projection onto the substrate 10, each pixel group DD including at least one row of pixel cells 60, the plurality of pixel groups DD including at least a first pixel group DD1 and a second pixel group DD 2; in the first direction Y, the first pixel group DD1 is located on a side of the second pixel group DD2 away from the fingerprint identification signal receiving unit 40;
the area of the orthographic projection of the fingerprint identification units 20 of the first pixel group DD1 to the substrate base plate 10 is larger than the area of the orthographic projection of the fingerprint identification units 20 of the second pixel group DD2 to the substrate base plate 10.
The embodiment further explains that the array substrate 000 further includes a plurality of scanning lines G, a plurality of data lines S, and a plurality of pixel units 60 for implementing the display function and the fingerprint identification function of the display panel, each pixel unit 60 includes a plurality of sub-pixels 601 and at least one fingerprint identification unit 20, and the scanning lines G and the data lines S are crossed and insulated to define the area where the plurality of sub-pixels 601 are located. And the plurality of fingerprint identification units 20 on the array substrate 000 are divided in another way, that is, divided into a plurality of pixel groups DD extending along the direction of the scanning line G, each pixel group DD comprises at least one row of pixel units 60, each pixel unit 60 comprises a plurality of sub-pixels 601 and at least one fingerprint identification unit 20, then at least a first pixel group DD1 and a second pixel group DD2 which are different from the fingerprint identification signal receiving unit 40 in length are present on the array substrate 000, that is, in the first direction Y, the first pixel group DD1 is located on the side of the second pixel group DD2 far away from the fingerprint identification signal receiving unit 40;
in the embodiment, the distances between the fingerprint identification units 20 in the pixel groups DD and the fingerprint identification signal receiving unit 40 are distinguished in a manner that the pixel groups DD are divided by the plurality of fingerprint identification units 20, so that different signal attenuation degrees of detection voltages emitted by the fingerprint identification units 20 in different pixel groups DD on the fingerprint signal lines 30 are obtained, different sizes of the detection voltages emitted by the fingerprint identification units 20 in different pixel groups DD to the fingerprint signal lines 30 are set, and the purposes that the detection signals in the pixel groups DD with different distances received by the fingerprint identification signal receiving unit 40 are as uniform as possible and the accuracy of fingerprint identification is improved are achieved.
Optionally, in this embodiment, when the forward projection areas of the plurality of sub-pixels 601 and the at least one fingerprint identification unit 20 in each pixel group DD are set to be the same, the forward projection area of the fingerprint identification unit 20 of the first pixel group DD1 projected onto the substrate 10 is larger than the forward projection area of the fingerprint identification unit 20 of the second pixel group DD2 projected onto the substrate 10, so that under the same illumination, the photocurrent generated by the fingerprint identification unit 20 of the first pixel group DD1 at the far end is larger, and the photocurrent generated by the fingerprint identification unit 20 of the second pixel group DD2 at the near end is smaller, so that the detection voltage G sent by the fingerprint identification unit 20 of the first pixel group DD1 to the fingerprint signal line 30 is larger than the detection voltage H sent by the fingerprint identification unit 20 of the second pixel group DD2 to the fingerprint signal line 30, and the fingerprint identification unit 20 of the first pixel group 1 and the fingerprint identification unit 20 of the second pixel group DD2 received by the fingerprint identification signal receiving unit 40 can detect the fingerprint signal line 30 The signals are uniform as much as possible, and the accuracy of fingerprint identification is improved.
It should be noted that each pixel group DD of the present embodiment includes at least one row of pixel units 60, that is, each pixel group DD may include one row, two rows, or multiple rows of pixel units 60, and the present embodiment is not particularly limited, and may be set according to actual situations in specific implementation. In this embodiment, the detection voltages sent to the fingerprint signal line 30 by the two or more rows of pixel units 60 included in each pixel group DD may be set to be the same or different, and it is only necessary to satisfy that the detection signals in each pixel group DD with different distances received by the fingerprint identification signal receiving unit 40 are as uniform as possible.
It should be further noted that, since the area of the forward projection of the plurality of sub-pixels 601 and the at least one fingerprint identification unit 20 in each pixel group DD to the substrate 10 is set to be the same, and the area of the forward projection of the fingerprint identification unit 20 of the first pixel group DD1 to the substrate 10 is larger than the area of the forward projection of the fingerprint identification unit 20 of the second pixel group DD2 to the substrate 10, the area of the forward projection of the pixel unit 60 of the first pixel group DD1 to the substrate 10 is smaller than the area of the forward projection of the pixel unit 60 of the second pixel group DD2 to the substrate 10, so that the aperture ratio of the pixel unit 60 of the first pixel group DD1 is lower, and the display brightness is lower, therefore, in order to solve this problem, optionally, the compensation signal can be provided by the driving chip to compensate the data line S, the charging voltage of the pixel unit 60 of the first pixel group DD1 is increased, the loss of display brightness due to the smaller area of the orthographic projection of the pixel units 60 of the first pixel group DD1 on the substrate base plate 10 is compensated.
In some alternative embodiments, please refer to fig. 8, fig. 8 is a schematic plane structure diagram of another array substrate according to an embodiment of the present invention, in this embodiment, the first pixel group DD1 includes at least two rows of seventh fingerprint identification units 207, and forward projection areas of the seventh fingerprint identification units 207 onto the substrate 10 are equal;
the second pixel group DD2 includes at least two rows of eighth fingerprint identification units 208, and the areas of the orthographic projections of the eighth fingerprint identification units 208 on the substrate 10 are equal.
This embodiment further illustrates that each pixel group DD includes at least two rows of pixel units 60, and defines the forward projection area of the two rows of pixel units 60 onto the substrate 10, that is, the first pixel group DD1 at the far end includes at least two rows of seventh fingerprint identification units 207, and the forward projection areas of the seventh fingerprint identification units 207 onto the substrate 10 are equal; the proximal second pixel group DD2 includes at least two rows of eighth fingerprint identification cells 208, and the area of the orthographic projection of each eighth fingerprint identification cell 208 onto the substrate base plate 10 is equal, therefore, the effect of detecting signals in the first pixel group DD1 and the second pixel group DD2 with different distances received by the fingerprint identification signal receiving unit 40 as uniform as possible can be satisfied, it is also possible to have at the same time the seventh fingerprinting unit 207 for at least two rows within the first pixel group DD1, and then simultaneously provide scanning drive signals to at least two rows of eighth fingerprint identification units 208 in the second group of pixels DD2, so that the fingerprint identification units 20 with the same number of lines can be divided into the pixel groups DD as few as possible, thereby improving the driving scanning efficiency, saving the scanning time, in addition, the first pixel group DD1 includes at least two rows of seventh fingerprint identification units 207, and the forward projection areas of the seventh fingerprint identification units 207 to the substrate base plate 10 are equal; the second pixel group DD2 includes at least two rows of eighth fingerprint identification units 208, and the areas of the orthographic projections of the eighth fingerprint identification units 208 on the substrate 10 are equal, so that the process is simple.
In some optional embodiments, please refer to fig. 9, fig. 9 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and the display panel 111 according to the embodiment includes the array substrate 000 according to the embodiment. The display panel 111 in the embodiment of fig. 9 is only illustrated by taking a mobile phone as an example, and it should be understood that the display panel 111 provided in the embodiment of the present invention may be a display panel 111 having a display function, such as a computer, a television, an electronic paper, and an in-vehicle display device, and the present invention is not limited thereto. The display panel 111 provided in the embodiment of the present invention has the beneficial effects of the array substrate 000 provided in the embodiment of the present invention, and specific descriptions of the array substrate 000 in the above embodiments may be specifically referred to, and this embodiment is not described herein again.
According to the embodiment, the array substrate and the display panel provided by the invention at least realize the following beneficial effects:
in the invention, in the first direction, the first fingerprint identification unit is arranged at one side of the second fingerprint identification unit far away from the fingerprint identification signal receiving unit, namely the first fingerprint identification unit is a fingerprint identification unit far away from the fingerprint identification signal receiving unit, the second fingerprint identification unit is a fingerprint identification unit near to the fingerprint identification signal receiving unit, and the detection voltage sent to the fingerprint signal line by the first fingerprint identification unit is set to be larger than the detection voltage sent to the fingerprint signal line by the second fingerprint identification unit, namely the first voltage is larger than the second voltage, so that even if the first fingerprint identification unit is far away from the fingerprint identification signal receiving unit, the first voltage sent to the fingerprint signal line by the first fingerprint identification unit is attenuated more in the transmission process to the fingerprint identification signal receiving unit, but when the first fingerprint identification unit is transmitted to the fingerprint identification signal receiving unit, compare when the second voltage that sends to the fingerprint signal line with second fingerprint identification unit transmits to fingerprint identification signal receiving element, the difference of size between them is less or the same basically, can make the detection signal of the first fingerprint identification unit that fingerprint identification signal receiving element received and the detection signal of the second fingerprint identification unit that fingerprint identification signal receiving element received equal basically, thereby improved the intensity of first fingerprint identification unit detected signal, the detection signal of the different fingerprint identification units of distance that makes fingerprint identification signal receiving element receive is as homogeneous as far as possible, thereby can improve fingerprint identification's the degree of accuracy.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. An array substrate, comprising: the fingerprint identification device comprises a substrate base plate, a plurality of fingerprint identification units arranged in an array manner, a plurality of fingerprint signal lines extending along a first direction and a fingerprint identification signal receiving unit, wherein the fingerprint identification units are positioned on the substrate base plate; the fingerprint identification unit is electrically connected with the fingerprint identification signal receiving unit through the fingerprint signal line, one end of the fingerprint signal line is electrically connected with the fingerprint identification unit, and the other end of the fingerprint signal line is electrically connected with the fingerprint identification signal receiving unit;
the fingerprint identification unit at least comprises a first fingerprint identification unit and a second fingerprint identification unit, and the first fingerprint identification unit is positioned on one side of the second fingerprint identification unit, which is far away from the fingerprint identification signal receiving unit, along the first direction; the detection voltage sent to the fingerprint signal line by the first fingerprint identification unit is a first voltage, and the detection voltage sent to the fingerprint signal line by the second fingerprint identification unit is a second voltage; wherein the first voltage is greater than the second voltage.
2. The array substrate of claim 1, further comprising a plurality of fingerprint scanning lines extending along a second direction, wherein the fingerprint scanning lines and the fingerprint signal lines are crossed and insulated to define an area where a plurality of fingerprint identification units are located, and at least two fingerprint identification units in the same row of fingerprint identification units are electrically connected with the same fingerprint scanning line; wherein the second direction intersects the first direction;
the fingerprint identification unit comprises a switch transistor and a photodiode which are electrically connected, the switch transistor comprises a grid electrode, a source electrode and a drain electrode, the grid electrode is electrically connected with the fingerprint scanning line, the source electrode is electrically connected with the cathode of the photodiode, the drain electrode is electrically connected with the fingerprint signal line, the anode of the photodiode is connected with a bias voltage, the cathode of the photodiode is connected with a reference voltage, the reference voltage is externally provided for a fixed voltage of the cathode of the photodiode, or the reference voltage is provided for the fingerprint signal line for a fixed voltage of the cathode of the photodiode.
3. The array substrate of claim 2, wherein the fingerprint identification units in a same row are electrically connected to a same one of the fingerprint scanning lines.
4. The array substrate of claim 2,
the array substrate comprises a plurality of fingerprint identification areas extending along the second direction, each fingerprint identification area at least comprises a row of fingerprint identification units, and the plurality of fingerprint identification areas at least comprise a first fingerprint identification area and a second fingerprint identification area; along the first direction, the first fingerprint identification area is positioned on one side of the second fingerprint identification area, which is far away from the fingerprint identification signal receiving unit.
5. The array substrate of claim 4, wherein each fingerprint identification area comprises at least two rows of fingerprint identification units.
6. The array substrate of claim 4,
the first fingerprint identification area comprises a third fingerprint identification unit, the third fingerprint identification unit comprises a third photodiode, the anode of the third photodiode is connected with a third bias voltage, and the cathode of the third photodiode is connected with a third reference voltage;
the second fingerprint identification area comprises a fourth fingerprint identification unit, the fourth fingerprint identification unit comprises a fourth photodiode, the anode of the fourth photodiode is connected with a fourth bias voltage, and the cathode of the fourth photodiode is connected with a fourth reference voltage;
the third reference voltage is the same as the fourth reference voltage, and the third bias voltage is greater than the fourth bias voltage.
7. The array substrate of claim 4,
the first fingerprint identification area comprises a fifth fingerprint identification unit, the fifth fingerprint identification unit comprises a fifth photodiode, the anode of the fifth photodiode is connected with a fifth bias voltage, and the cathode of the fifth photodiode is connected with a fifth reference voltage;
the second fingerprint identification area comprises a sixth fingerprint identification unit, the sixth fingerprint identification unit comprises a sixth photodiode, the anode of the sixth photodiode is connected with a sixth bias voltage, and the cathode of the sixth photodiode is connected with a sixth reference voltage;
the fifth bias voltage is the same as the sixth bias voltage, and the fifth reference voltage is greater than the sixth reference voltage.
8. The array substrate of claim 1,
the fingerprint identification device further comprises a plurality of scanning lines, a plurality of data lines and a plurality of pixel units, wherein each pixel unit comprises a plurality of sub-pixels and at least one fingerprint identification unit, and the scanning lines and the data lines are crossed and insulated to define areas where the sub-pixels are located;
a plurality of pixel groups extending along the scanning line direction, wherein the forward projection area of each pixel group to the substrate is the same, each pixel group at least comprises one row of pixel units, and the plurality of pixel groups at least comprise a first pixel group and a second pixel group; along the first direction, the first pixel group is positioned on one side of the second pixel group, which is far away from the fingerprint identification signal receiving unit;
the area of the orthographic projection of the fingerprint identification unit of the first pixel group to the substrate base plate is larger than the area of the orthographic projection of the fingerprint identification unit of the second pixel group to the substrate base plate.
9. The array substrate of claim 8,
the first pixel group comprises at least two rows of seventh fingerprint identification units, and the orthographic projection areas of the seventh fingerprint identification units to the substrate are equal;
the second pixel group comprises at least two rows of eighth fingerprint identification units, and the orthographic projection areas of the eighth fingerprint identification units to the substrate are equal.
10. A display panel comprising the array substrate according to any one of claims 1 to 9.
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| CN110008860B (en) * | 2019-03-21 | 2021-09-24 | 武汉华星光电技术有限公司 | Fingerprint identification framework and touch panel |
| CN110008883B (en) * | 2019-03-28 | 2021-06-18 | 厦门天马微电子有限公司 | Display panel and display device |
| CN110929700B (en) * | 2019-12-27 | 2022-09-13 | 厦门天马微电子有限公司 | Fingerprint identification display panel, driving method thereof and fingerprint identification display device |
| CN112906496B (en) * | 2021-01-28 | 2022-09-09 | 湖北长江新型显示产业创新中心有限公司 | Fingerprint identification circuit, fingerprint identification method and display device |
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