CN114333585B - display device - Google Patents
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- CN114333585B CN114333585B CN202111623526.1A CN202111623526A CN114333585B CN 114333585 B CN114333585 B CN 114333585B CN 202111623526 A CN202111623526 A CN 202111623526A CN 114333585 B CN114333585 B CN 114333585B
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- 239000003990 capacitor Substances 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 3
- 238000012795 verification Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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Abstract
The invention provides a display device, which comprises a plurality of fingerprint sensing pixels, wherein each fingerprint sensing pixel comprises a fingerprint sensing circuit. During display, pixels below the fingerprint sensing pixels display a portion of the fingerprint background image, during fingerprint sensing subsequent to the display period, a fingerprint image is generated from the signal from the fingerprint sensing circuit, and the fingerprint image is subtracted from the fingerprint background image to generate a fingerprint foreground image.
Description
Technical Field
The invention relates to a display device with fingerprint sensing function, which improves the fingerprint sensing function by changing the display of pixels.
Background
Fingerprints are natural to everyone, and with the development of technology, various display devices with fingerprint identification functions, such as mobile phones, tablet computers, wearable devices and the like, are appeared on the market. When a user operates the display device with the fingerprint identification function, the user can conduct authority verification only by touching the display device with a finger, and the authority verification process is simplified. However, there may be signal interference between the display device and the fingerprint recognition circuit.
Disclosure of Invention
An embodiment of the present invention provides a display device including: the data line and the fingerprint sensing line extend along the same direction, and a circuit is connected to the data line and the fingerprint sensing line. The plurality of pixels are arranged in a plurality of rows and a plurality of columns, wherein each pixel is connected to one data line. The pixel comprises a plurality of fingerprint sensing pixels and a plurality of first pixels, each fingerprint sensing pixel comprises a fingerprint sensing circuit, each fingerprint sensing circuit is connected to one fingerprint sensing line, and each first pixel and one fingerprint pixel are connected to the same data line. A fingerprint sensing period is directly subsequent to a display period. During display, the circuit transmits gray-scale data to the pixels through the data lines, so that the first pixels display a part of a fingerprint background image, and the display sequence of the first pixels is behind the display sequence of the fingerprint sensing pixels. During fingerprint sensing, the circuit receives signals from the fingerprint sensing circuit through the fingerprint sensing line to generate a fingerprint image, and subtracts the fingerprint image from the fingerprint background image to generate a fingerprint foreground image.
In some embodiments, the data line and the fingerprint sensing line are disposed on an insulating layer and belong to the same metal layer.
In some embodiments, the data line is disposed on a first side of the insulating layer, and the fingerprint sensing line is disposed on a second side of the insulating layer, the second side being opposite to the first side. The fingerprint sensing line overlaps the data line as viewed from the normal vector of the upper surface of the insulating layer.
In some embodiments, the pixels are enabled in the order of the columns during display, with at least a portion of the first pixels being disposed in the last column.
In some embodiments, the display device includes a display area and a non-display area, and the fingerprint sensing pixels and the first pixels are disposed in the display area.
In some embodiments, the first pixel is immediately adjacent to the fingerprint sensing pixel.
In some embodiments, the fingerprint sensing pixels are disposed in the display area, and the first pixels are disposed in the non-display area.
In some embodiments, each fingerprint sensing pixel further comprises a first switch, a first end of the first switch is connected to the corresponding fingerprint sensing circuit, a control end of the first switch is connected to the corresponding sensing gate line, and a second end of the first switch is connected to the corresponding fingerprint sensing line. The circuit comprises an amplifier, a first capacitor and a second capacitor. The amplifier has a first end, a second end and an output end, and the second end of the amplifier is connected to the ground voltage. The first end of the first capacitor is connected to the fingerprint sensing line, and the second end of the second capacitor is connected to the first end of the amplifier. The first end of the second capacitor is connected to the first end of the amplifier, and the second end of the second capacitor is connected to the output end of the amplifier.
In some embodiments, each fingerprint sensing pixel further comprises a second switch and a third switch. The control end of the second switch is connected to the corresponding fingerprint sensing circuit, and the first end of the third switch is connected to the operating voltage. The first end of the third switch is connected to the second end of the second switch, the control end of the third switch is connected to the corresponding sensing gate line, and the second end of the third switch is connected to the corresponding fingerprint sensing line.
In some embodiments, each fingerprint sensing pixel further comprises a fourth switch and a fifth switch. The control end of the fourth switch is connected to the corresponding fingerprint sensing circuit, and the fifth end of the fourth switch is connected to the ground voltage. The first end of the fifth switch is connected to the corresponding fingerprint sensing line, the second end of the fifth switch is connected to the first end of the fourth switch, and the control end of the fifth switch is connected to the corresponding sensing gate line.
The invention will now be described in more detail with reference to the drawings and specific examples, which are not intended to limit the invention thereto.
Drawings
Fig. 1 is a schematic diagram illustrating a display device according to an embodiment.
FIG. 2 is a schematic diagram illustrating a display period and a fingerprint sensing period according to an embodiment.
Fig. 3 and 4 are cross-sectional views illustrating the arrangement of data lines and fingerprint sensing lines according to an embodiment.
Fig. 5 to 7 are schematic diagrams illustrating display frames according to an embodiment.
Fig. 8-10 illustrate related circuits that provide fingerprint sensing functionality, according to some embodiments.
Wherein, the reference numerals:
100 display device
110 gate driving circuit
120 circuit
R1 to R3 are the columns
C1 to C2 row
SG 1-SG 3 sense gate line
G1 to G3 grid lines
D1-D2 data line
Fs1.about.Fs2. Fingerprint sensing line
P1 to P6 pixels
141-146 fingerprint sensing circuit
X, Y direction
210 display period
220 fingerprint sensing period
C capacitance
INS insulating layer
410 normal vector
510 fingerprint sensing area
520,720 area
710 display area
712 non-display area
M1-M5 switch
C1, C2: capacitance device
810: amplifier
M1-1, M2-1, M3-1, M4-1, M5-1, C1-1, C2-1,811: first end
M1-2, M2-2, M3-2, M4-2, M5-2, C1-2, C2-2,812: second end
M1-3, M2-3, M3-3, M4-3, M5-3: control terminal
813 output end
VDD: operating voltage
Detailed Description
The structural and operational principles of the present invention are described in detail below with reference to the accompanying drawings:
the terms "first," "second," and the like as used herein do not denote a particular order or sequence, but rather are merely used to distinguish one element or operation from another in the same technical term.
Fig. 1 is a schematic diagram illustrating a display device according to an embodiment. Referring to fig. 1, the display device 100 includes a gate driving circuit 110, a circuit 120, gate lines G1 to G3, sensing gate lines SG1 to SG3, data lines D1 to D2, fingerprint sensing lines FS1 to FS2, and pixels P1 to P6. The pixels P1 to P6 are arranged in a plurality of rows C1 to C2 and a plurality of columns R1 to R3. For simplicity, fig. 1 shows only 6 pixels, but the number of pixels in the display device is not limited by the present invention.
The gate lines G1 to G3 and the sensing gate lines SG1 to SG3 extend along the X-direction and are connected to the gate driving circuit 110, and the data lines D1 to D2 and the fingerprint sensing lines FS1 to FS2 extend along the Y-direction and are connected to the circuit 120. The circuit 120 may be referred to as a source driver or a fingerprint sensing circuit, and may provide both display and fingerprint sensing functions, and in some embodiments the circuit 120 may be split into more circuits, where one circuit may be disposed above to provide the display function and another circuit may be disposed below to provide the fingerprint sensing function. The present invention does not limit the splitting of the circuit 120 into several circuits nor the location of the circuit 120.
Each of the pixels P1 to P6 may include a thin film transistor, a pixel electrode and a common electrode, or each of the pixels P1 to P6 may include a light emitting diode, which are not shown for simplicity. In addition, the pixels P1 to P6 have fingerprint sensing circuits 141 to 146, respectively, and the fingerprint sensing circuits 141 to 146 may be optical sensing circuits or capacitive sensing circuits. For example, if optical sensing circuits are used, each of the fingerprint sensing circuits 141-146 includes a photo sensor; if capacitive sensing circuits are used, each of the fingerprint sensing circuits 141-146 includes an electrode that forms a capacitance with the user's finger, and ridges (ridges) and valleys (valleys) on the fingerprint can be sensed by the change in capacitance.
Each pixel is connected to one gate line and one data line, for example, pixel P1 is connected to gate line G1 and data line D1, and so on. Each fingerprint sensing circuit is connected to one sensing gate line and one fingerprint sensing line, e.g., fingerprint sensing circuit 141 is connected to sensing gate line SG1 and fingerprint sensing line FS1, and so on. The gate lines G1 to G3 are used to enable the corresponding pixels (e.g. turn on the tfts in the pixels) according to the order of the rows R1 to R3, and the circuit 120 is used to transmit the pixel data to the enabled pixels through the data lines D1 to D2 to display a specific brightness. The sensing gate lines SG1 to SG3 are used for enabling the corresponding pixels according to the sequence of the rows R1 to R3, the enabled pixels transmit signals to the circuit 120 through the fingerprint sensing lines FS1 to FS2, and the circuit 120 can generate a fingerprint image according to the signals. For example, when an optical sensing circuit is used, the signals on the fingerprint sensing lines FS 1-FS 2 represent gray scale values; when a capacitive sensing circuit is used, the signals on the fingerprint sensing lines FS 1-FS 2 represent capacitance values, which can also be converted into gray scale values that can form a fingerprint image.
Here, the display function and the fingerprint sensing function are provided in a time-sharing manner. FIG. 2 is a schematic diagram illustrating a display period and a fingerprint sensing period according to an embodiment. Referring to fig. 1 and 2, during a display period 210, the pixels in the rows R1 to R3 are sequentially enabled. The fingerprint sensing period 220 is directly followed by the display period 210, and the fingerprint sensing circuits on the fingerprint sensing periods 220 rows R1-R3 are also sequentially enabled. In some embodiments, the display period 210 and the fingerprint sensing period 220 may belong to the same frame (frame), but the invention is not limited thereto.
Since each data line is adjacent to one fingerprint sensing line (e.g., data line D1 is adjacent to fingerprint sensing line FS 1), parasitic capacitance exists between the data line and the adjacent fingerprint sensing line. For example, fig. 3 and 4 are cross-sectional views illustrating the arrangement of data lines and fingerprint sensing lines according to an embodiment. Taking the data line D1 and the fingerprint sensing line FS1 as an example, in the embodiment of fig. 3, the data line D1 and the fingerprint sensing line FS1 are disposed on the insulating layer INS, the data line D1 and the fingerprint sensing line FS1 belong to the same metal layer, and a parasitic capacitance C is formed between the two lines. In the embodiment of fig. 4, the data line D1 is disposed on the upper side of the insulating layer INS, the fingerprint sensing line FS1 is disposed on the lower side of the insulating layer INS, and the data line D1 and the fingerprint sensing line FS1 are at least partially overlapped with each other as viewed from the normal vector 410 of the upper surface of the insulating layer INS, so that the parasitic capacitance C is also formed by this arrangement. In other embodiments, the data line D1 may also be disposed on the lower side of the insulating layer INS, and the fingerprint sensing line FS1 may be disposed on the upper side of the insulating layer INS. For simplicity, fig. 3 and 4 do not show all elements of the display device, such as the gate line, may belong to another metal layer. Referring back to fig. 2, after the last column of pixels is displayed, the signal on the data line D1 interferes with the signal on the fingerprint sensing line FS1, which affects fingerprint sensing, since the signal immediately enters the fingerprint sensing period.
FIG. 5 is a schematic diagram illustrating a display according to an embodiment. Referring to fig. 5, when providing the fingerprint sensing function, the display device 100 can display any screen and instruct the user to press a finger on the fingerprint sensing area 510 to generate a fingerprint image. The fingerprint image is subtracted from a predetermined fingerprint background image, thereby calculating a fingerprint foreground image, which can be used for registration or identification, etc., but the invention is not limited thereto. However, if the preset fingerprint background image is different from the currently displayed image, the interference degree of the data line to the fingerprint sensing line is also different, which may make the obtained fingerprint foreground image not be expected, and thus cause a recognition error. Therefore, before entering the fingerprint sensing period, a portion of the pixels must be made to display a portion of the fingerprint background image.
Herein, the pixels within the fingerprint sensing region 510 are referred to as fingerprint sensing pixels, and the pixels below the fingerprint sensing region 510 are referred to as first pixels. For example, in fig. 1, if the pixels P1 and P2 are fingerprint sensing pixels, the pixels P3 to P6 may be referred to as first pixels, or only the pixels P5 and P6 may be referred to as first pixels. It should be noted that the pixels P1, P3, P5 share the same data line D1, and the pixels P2, P4, P6 share the same data line D2. In addition, the display order of the pixels P3, P5 follows the display order of the pixel P1, and the display order of the pixels P4, P6 follows the display order of the pixel P2. During display, the first pixel will display a portion of the fingerprint background image. For example, the fingerprint background image may be a full black picture, so pixels P3-P6 may display black during display. In this way, unexpected interference of the data line to the fingerprint sensing line can be avoided during fingerprint sensing.
In this embodiment, all pixels include fingerprint sensing circuitry, but in other embodiments it is contemplated that only pixels in fingerprint sensing region 510 include fingerprint sensing circuitry, while other pixels do not include fingerprint sensing circuitry.
Those pixels may display a fingerprint background image, as will be described in several embodiments below. The display device 100 may include a display area and a non-display area. In the embodiment of fig. 5, the pixels in the fingerprint sensing area 510 and the area 520 belong to the display area, and the area 520 includes the pixels in the last column, that is, only the pixels in the last column will display the fingerprint background image. In the embodiment of fig. 6, all pixels below the fingerprint sensing region 510 (including the last column of pixels) will display the fingerprint background image, i.e., part of the first pixels are immediately adjacent to the fingerprint sensing pixels in the fingerprint sensing region 510. In the embodiment of fig. 7, the fingerprint sensing area 510 is located in the display area 710, but the area 720 is located in the non-display area 712, and the pixels (including the last row of pixels) in the area 720 display the fingerprint background image, so that the currently displayed image is not affected.
Fig. 8-10 illustrate related circuits that provide fingerprint sensing functionality, according to some embodiments. Taking pixel P1 as an example here, the same applies to other pixels. In the embodiment of FIG. 8, the pixel P1 further includes a switch M1, the switch M1 has a first terminal M1-1, a second terminal M1-2 and a control terminal M1-3, wherein the control terminal M1-3 is connected to the sensing gate line SG1, the first terminal M1-1 is connected to the fingerprint sensing circuit 141, and the second terminal M1-2 is connected to the fingerprint sensing line FS1. The circuit 120 includes a capacitor C1, a capacitor C2, and an amplifier 810. The first terminal C1-1 of the capacitor C1 is connected to the fingerprint sensing line FS1, and the second terminal C1-2 of the capacitor C1 is connected to the first terminal 811 of the amplifier 810. A second terminal 812 of the amplifier 810 is connected to ground. The first terminal C2-1 of the capacitor C2 is connected to the first terminal 811 and the second terminal C2-2 of the capacitor C2 is connected to the output terminal 813 of the amplifier 810.
In the embodiment of fig. 9, the pixel P1 further includes a switch M2 and a switch M3. The first terminal M2-1 of the switch M2 is connected to the operating voltage VDD, the control terminal M2-3 of the switch M2 is connected to the fingerprint sensing circuit 141, and the second terminal M2-2 of the switch M2 is connected to the first terminal M3-1 of the switch M3. The second terminal M3-2 of the switch M3 is connected to the fingerprint sensing line FS1, and the control terminal M3-3 of the switch M3 is connected to the sensing gate line SG1.
In the embodiment of fig. 10, the pixel P1 further includes a switch M4 and a switch M5. The control terminal M4-3 of the switch M4 is connected to the fingerprint sensing circuit 141, the second terminal M4-2 of the switch M4 is connected to the ground voltage, the first terminal M4-1 of the switch M4 is connected to the second terminal M5-2 of the switch M5, the control terminal M5-3 of the switch M5 is connected to the sensing gate line SG1, and the first terminal M5-1 of the switch M5 is connected to the fingerprint sensing line FS1.
Of course, the present invention is capable of other various embodiments and its several details are capable of modification and variation in light of the present invention, as will be apparent to those skilled in the art, without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A display device, comprising:
a plurality of data lines;
the data lines and the fingerprint sensing lines extend along the same direction;
at least one circuit connected to the data lines and the fingerprint sensing lines; and
a plurality of pixels arranged in a plurality of rows and a plurality of columns, wherein each pixel is connected to one of the data lines, the pixels comprise a plurality of fingerprint sensing pixels and a plurality of first pixels, each fingerprint sensing pixel comprises a fingerprint sensing circuit, each fingerprint sensing circuit is connected to one of the fingerprint sensing lines, each first pixel and one of the fingerprint sensing pixels are connected to the same data line, the fingerprint sensing pixels are positioned in a fingerprint sensing area, the first pixels are positioned below the fingerprint sensing area,
wherein a fingerprint sensing period is directly subsequent to a display period,
wherein during the displaying period, the at least one circuit transmits gray-scale data to the pixels through the data lines, so that the first pixels display a part of a fingerprint background image, the display sequence of the first pixels is after the display sequence of the fingerprint sensing pixels,
during the fingerprint sensing, the at least one circuit receives signals from the fingerprint sensing circuits through the fingerprint sensing lines to generate a fingerprint image, and subtracts the fingerprint image from the fingerprint background image to generate a fingerprint foreground image.
2. The display device of claim 1, wherein the data lines and the fingerprint sensing lines are disposed on an insulating layer and belong to the same metal layer.
3. The display device of claim 1, wherein the data lines are disposed on a first side of an insulating layer, the fingerprint sensing lines are disposed on a second side of the insulating layer, the second side being opposite to the first side,
each fingerprint sensing line is overlapped with one of the data lines in normal vector view of the upper surface of the insulating layer.
4. The display device of claim 1, wherein the pixels are enabled in the order of the rows during the display, at least a portion of the first pixels being disposed in a last one of the rows.
5. The display device of claim 4, wherein the display device comprises a display area and a non-display area, the fingerprint sensing pixels and the first pixels being disposed in the display area.
6. The display device of claim 5, wherein a portion of the first pixels are directly adjacent to the fingerprint sensing pixels.
7. The display device of claim 4, wherein the display device comprises a display area and a non-display area, the fingerprint sensing pixels are disposed in the display area, and the first pixels are disposed in the non-display area.
8. The display device of claim 1, wherein each of the plurality of fingerprint sensing pixels further comprises a first switch having a first terminal connected to the corresponding fingerprint sensing circuit, a control terminal connected to a corresponding one of the plurality of sensing gate lines, a second terminal connected to the corresponding fingerprint sensing line,
the at least one circuit includes:
an amplifier having a first end, a second end and an output end, wherein the second end of the amplifier is connected to a ground voltage;
a first capacitor, a first end of which is connected to one of the fingerprint sensing lines, and a second end of which is connected to the first end of the amplifier; and
and the first end of the second capacitor is connected to the first end of the amplifier, and the second end of the second capacitor is connected to the output end of the amplifier.
9. The display device of claim 1, wherein each of the fingerprint sensing pixels further comprises:
the control end of the second switch is connected to the corresponding fingerprint sensing circuit, and the first end of the second switch is connected to an operating voltage; and
the first end of the third switch is connected to the second end of the second switch, the control end of the third switch is connected to a corresponding sensing gate line, and the second end of the third switch is connected to the corresponding fingerprint sensing line.
10. The display device of claim 1, wherein each of the fingerprint sensing pixels further comprises:
the control end of the fourth switch is connected to the corresponding fingerprint sensing circuit, and the second end of the fourth switch is connected to a grounding voltage; and
the first end of the fifth switch is connected to the corresponding fingerprint sensing line, the second end of the fifth switch is connected to the first end of the fourth switch, and the control end of the fifth switch is connected to a corresponding sensing gate line.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW110128565 | 2021-08-03 | ||
| TW110128565A TWI785714B (en) | 2021-08-03 | 2021-08-03 | Display device having fingerprint sensing function |
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| Publication Number | Publication Date |
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| CN114333585A CN114333585A (en) | 2022-04-12 |
| CN114333585B true CN114333585B (en) | 2023-11-10 |
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| TW (1) | TWI785714B (en) |
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Also Published As
| Publication number | Publication date |
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| CN114333585A (en) | 2022-04-12 |
| TW202307630A (en) | 2023-02-16 |
| TWI785714B (en) | 2022-12-01 |
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