CN114333585A - Display device - Google Patents
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- CN114333585A CN114333585A CN202111623526.1A CN202111623526A CN114333585A CN 114333585 A CN114333585 A CN 114333585A CN 202111623526 A CN202111623526 A CN 202111623526A CN 114333585 A CN114333585 A CN 114333585A
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- fingerprint sensing
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- 239000003990 capacitor Substances 0.000 claims description 21
- 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
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
The present invention provides a display device, which includes a plurality of fingerprint sensing pixels, each of which includes a fingerprint sensing circuit. During the display period, the pixel below the fingerprint sensing pixel displays a part of the fingerprint background image, during the fingerprint sensing period after the display period, the fingerprint image is generated according to the signal from the fingerprint sensing circuit, and the fingerprint image and the fingerprint background image are subtracted to generate a fingerprint foreground image.
Description
Technical Field
The invention relates to a display device with a fingerprint sensing function, which improves the fingerprint sensing function by changing the display of pixels.
Background
Fingerprints are inherent to everyone, and with the development of technology, a variety of display devices with fingerprint identification functions, such as mobile phones, tablet computers, wearable devices and the like, appear on the market. When a user operates the display device with the fingerprint identification function, the authority can be verified 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 immediately follows a display period. During the display period, the circuit transmits the 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 a signal 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 lines are disposed on an insulating layer and belong to the same metal layer as the fingerprint sensing lines.
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. From a normal vector view of the upper surface of the insulating layer, the fingerprint sensing line overlaps the data line.
In some embodiments, the pixels are enabled in a row order during the display period, and at least a portion of the first pixels are disposed in a last row.
In some embodiments, the display device includes a display area and a non-display area, and the fingerprint sensing pixel and the first pixel are disposed in the display area.
In some embodiments, the first pixel is directly 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 includes 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 a 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 first switch and a second switch. The control end of the first switch is connected to the corresponding fingerprint sensing circuit, and the first end of the second switch is connected to the operating voltage. The first end of the second switch is connected to the second end of the first switch, the control end of the second switch is connected to the corresponding sensing grid line, and the second end of the second switch is connected to the corresponding fingerprint sensing line.
In some embodiments, each fingerprint sensing pixel further comprises a first switch and a second switch. The control end of the first switch is connected to the corresponding fingerprint sensing circuit, and the second end of the first switch is connected to the grounding voltage. The first end of the second switch is connected to the corresponding fingerprint sensing line, the second end of the second switch is connected to the first end of the first switch, and the control end of the second switch is connected to the corresponding sensing gate line.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited 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 a display screen according to an embodiment.
Fig. 8-10 illustrate related circuits for providing fingerprint sensing, according to some embodiments.
Wherein, the reference numbers:
100 display device
110 gate drive circuit
120: circuit
R1-R3
Line C1-C2
SG 1-SG 3 sense gate line
G1-G3 gate lines
D1-D2 data line
FS 1-FS 2 fingerprint sensing line
P1-P6 pixels
141-146 fingerprint sensing circuit
X, Y directions
210 display period
220 fingerprint sensing period
C is capacitor
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: capacitor with a capacitor element
810: amplifier with a high-frequency 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 and M5-3 as control terminals
813 output end
VDD operating Voltage
Detailed Description
The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:
as used herein, the terms "first," "second," and the like, do not denote any particular order or order, but rather are used to distinguish one element from another or from another element or operation described by 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-G3, sensing gate lines SG 1-SG 3, data lines D1-D2, fingerprint sensing lines FS 1-FS 2, and pixels P1-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 only shows 6 pixels, but the number of pixels in the display device is not limited by the invention.
The gate lines G1-G3 and the sensing gate lines SG 1-SG 3 extend along the X direction and are connected to the gate driving circuit 110, and the data lines D1-D2 and the fingerprint sensing lines FS 1-FS 2 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 the display function and the fingerprint sensing function, and in some embodiments, the circuit 120 may be divided into more circuits, wherein 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 circuit 120 from being split into several circuits, nor does it limit the location of the circuit 120.
Each of the pixels P1-P6 may include a tft, a pixel electrode and a common electrode, or each of the pixels P1-P6 may also include a light emitting diode (led), which are used to provide a display function, and are not shown for simplicity. In addition, the pixels P1-P6 have fingerprint sensing circuits 141-146, respectively, and the fingerprint sensing circuits 141-146 can be optical sensing circuits or capacitive sensing circuits. For example, if an optical sensing circuit is used, each of the fingerprint sensing circuits 141-146 includes a photo sensor (photosensor); if a capacitive sensing circuit is used, each of the fingerprint sensing circuits 141-146 includes an electrode, and a capacitance is formed between the electrode and the finger of the user, so that ridges (ridges) and valleys (valley) on the fingerprint can be sensed through the change of the capacitance.
Each pixel is connected to a gate line and a data line, e.g., pixel P1 is connected to gate line G1 and data line D1, and so on. Each fingerprint sensing circuit is connected to a sensing gate line and a fingerprint sensing line, for example, the fingerprint sensing circuit 141 is connected to the sensing gate line SG1 and the fingerprint sensing line FS1, and so on. The gate lines G1-G3 are used for enabling the corresponding pixels (e.g., turning on TFTs in the pixels) according to the sequence of the rows R1-R3, and the circuit 120 is used for transmitting pixel data to the enabled pixels through the data lines D1-D2 to display a specific brightness. The sensing gate lines SG 1-SG 3 are used for enabling corresponding pixels according to the sequence of rows R1-R3, the enabled pixels transmit signals to the circuit 120 through the fingerprint sensing lines FS 1-FS 2, and the circuit 120 can generate a fingerprint image according to the signals. For example, when an optical sensing circuit is adopted, the signals on the fingerprint sensing lines FS 1-FS 2 represent gray-scale values; when the capacitive sensing circuit is used, the signals on the fingerprint sensing lines FS1 to FS2 represent capacitance values, and these capacitance values can also be converted into gray-scale values, and these gray-scale values can constitute a fingerprint image.
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 FIG. 2, during the display period 210, the pixels in the rows R1-R3 are sequentially enabled. The fingerprint sensing period 220 is directly after the display period 210, and the fingerprint sensing circuits in the rows R1-R3 are also sequentially enabled during the fingerprint sensing period 220. 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 FS1), there may be a parasitic capacitance between the data line and the adjacent fingerprint sensing line. For example, fig. 3 and 4 are cross-sectional views illustrating the arrangement of the data lines and the 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, and 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 at least partially overlap each other from the normal vector 410 of the upper surface of the insulating layer INS, which also forms the parasitic capacitance C. In other embodiments, the data line D1 may 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 belonging to another metal layer. Referring back to fig. 2, after the last row of pixels is displayed, the signal on the data line D1 interferes with the signal on the fingerprint sensing line FS1 immediately after entering the fingerprint sensing period, which affects the sensing of the fingerprint.
FIG. 5 is a diagram illustrating a display according to an embodiment. Referring to fig. 5, when providing the fingerprint sensing function, the display device 100 may display an arbitrary screen and instruct the user to press a finger on the fingerprint sensing region 510 to generate a fingerprint image. The fingerprint image is subtracted from a preset fingerprint background image to calculate 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 frame, the interference degree of the data line to the fingerprint sensing line is also different, which makes the obtained fingerprint foreground image not as expected, and thus leads to identification error. Therefore, before entering the fingerprint sensing period, part of the pixels must be made to display a part of the background image of the fingerprint.
Here, pixels within the fingerprint sensing region 510 are referred to as fingerprint sensing pixels, and pixels below the fingerprint sensing region 510 are referred to as first pixels. For example, if the pixels P1 and P2 are fingerprint sensing pixels in fig. 1, the pixels P3-P6 may be referred to as first pixels, or only the pixels P5, P6 may be referred to as first pixels. It is noted that the pixels P1, P3, and P5 share the same data line D1, and the pixels P2, P4, and P6 share the same data line D2. Further, the display order of the pixels P3, P5 is after the display order of the pixel P1, and the display order of the pixels P4, P6 is after the display order of the pixel P2. During the display, the first pixel displays a part of the background image of the fingerprint. For example, the fingerprint background image may be a full black frame, so the pixels P3-P6 may display black during the display period. Therefore, unexpected interference of the data line to the fingerprint sensing line can be avoided during fingerprint sensing.
In this embodiment, all of the pixels include the fingerprint sensing circuit, but in other embodiments, it may be designed that only the pixels in the fingerprint sensing region 510 include the fingerprint sensing circuit, and the other pixels do not include the fingerprint sensing circuit.
The following will illustrate a number of embodiments in which those pixels can display a background image of a fingerprint. The display device 100 may include a display region and a non-display region. In the embodiment of fig. 5, the pixels in the fingerprint sensing region 510 and the pixels in the region 520 belong to the display area, and the region 520 includes the pixels in the last column, i.e. only the pixels in the last column display the background image of the fingerprint. In the embodiment of fig. 6, all pixels (including the last column of pixels) below the fingerprint sensing region 510 display the fingerprint background image, i.e., a portion of the first pixels are directly adjacent to the fingerprint sensing pixels in the fingerprint sensing region 510. In the embodiment of fig. 7, the fingerprint sensing region 510 is located in the display region 710, but the region 720 is located in the non-display region 712, and the pixels (including the last row of pixels) in the region 720 display the fingerprint background image, so that the currently displayed image is not affected.
Fig. 8-10 illustrate related circuits for providing fingerprint sensing, according to some embodiments. Here, pixel P1 is taken as an example, and so on for other pixels. In the embodiment of FIG. 8, the pixel P1 further includes a switch M1, the switch M1 has a first end M1-1, a second end M1-2 and a control end M1-3, wherein the control end M1-3 is connected to the sensing gate line SG1, the first end M1-1 is connected to the fingerprint sensing circuit 141, and the second end M1-2 is connected to the fingerprint sensing line FS 1. The circuit 120 includes a capacitor C1, a capacitor C2, and an amplifier 810. A first terminal C1-1 of the capacitor C1 is connected to the fingerprint sense line FS1, and a 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 a ground voltage. A first terminal C2-1 of the capacitor C2 is connected to the first terminal 811, and a second terminal C2-2 of the capacitor C2 is connected to the output 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 operation voltage VDD, the control terminal M3 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 end M3-2 of the switch M3 is connected to the fingerprint sensing line FS1, and the control end M3-3 of the switch M3 is connected to the sensing gate line SG 1.
In the embodiment of fig. 10, the pixel P1 further includes a switch M4 and a switch M5. The control end M4-3 of the switch M4 is connected to the fingerprint sensing circuit 141, the second end M4-2 of the switch M4 is connected to the ground voltage, the first end M4-1 of the switch M4 is connected to the second end M5-2 of the switch M5, the control end M5-3 of the switch M5 is connected to the sensing gate line SG1, and the first end M5-1 of the switch M5 is connected to the fingerprint sensing line FS 1.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one 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;
a plurality of fingerprint sensing lines, wherein 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 of the pixels is connected to one of the data lines, the pixels includes a plurality of fingerprint sensing pixels and a plurality of first pixels, each of the fingerprint sensing pixels includes a fingerprint sensing circuit, each of the fingerprint sensing circuits is connected to one of the fingerprint sensing lines, each of the first pixels and one of the fingerprint pixels are connected to the same data line,
wherein a fingerprint sensing period immediately follows a display period,
wherein during the display period, the at least one circuit transmits gray scale data to the pixels via the data lines such that the first pixels display a portion of a fingerprint background image, the display order of the first pixels being subsequent to the display order of the fingerprint sensing pixels,
during the fingerprint sensing period, 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 according to 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 of the fingerprint sensing lines overlaps one of the data lines from a normal vector view of the upper surface of the insulating layer.
4. The display device according to claim 1, wherein the pixels are enabled in the order of the rows during the display period, at least a portion of the first pixels being disposed in a last row of the rows.
5. The display device according to claim 4, wherein the display device comprises a display area and a non-display area, and the fingerprint sensing pixels and the first pixels are disposed in the display area.
6. The display device according to claim 5, wherein a portion of the first pixels are directly adjacent to the fingerprint sensing pixels.
7. The display device according to 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 fingerprint sensing pixels further comprises a first switch, a first terminal of the first switch is connected to the corresponding fingerprint sensing circuit, a control terminal of the first switch is connected to the corresponding sensing gate line, a second terminal of the first switch is connected to the corresponding fingerprint sensing line,
the at least one circuit includes:
an amplifier having a first terminal, a second terminal and an output terminal, wherein the second terminal of the amplifier is connected to a ground voltage;
a first capacitor, a first end of the first capacitor is connected to one of the fingerprint sensing lines, and a second end of the second capacitor is connected to the first end of the amplifier; and
and a second capacitor, wherein a first end of the second capacitor is connected to the first end of the amplifier, and a 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 first switch is connected to the corresponding fingerprint sensing circuit, and the first end of the second switch is connected to an operating voltage; and
a second switch, a first end of the second switch is connected to the second end of the first switch, a control end of the second switch is connected to the corresponding sensing gate line, and a second end of the second 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 first switch is connected to the corresponding fingerprint sensing circuit, and the second end of the first switch is connected to a ground voltage; and
a second switch, a first end of the second switch is connected to the corresponding fingerprint sensing line, a second end of the second switch is connected to the first end of the first switch, and a control end of the second switch is connected to the corresponding sensing gate line.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW110128565A TWI785714B (en) | 2021-08-03 | 2021-08-03 | Display device having fingerprint sensing function |
| TW110128565 | 2021-08-03 |
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| Publication Number | Publication Date |
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| CN114333585A true CN114333585A (en) | 2022-04-12 |
| CN114333585B CN114333585B (en) | 2023-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111623526.1A Active CN114333585B (en) | 2021-08-03 | 2021-12-28 | display device |
Country Status (2)
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| CN (1) | CN114333585B (en) |
| TW (1) | TWI785714B (en) |
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Also Published As
| Publication number | Publication date |
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| CN114333585B (en) | 2023-11-10 |
| TW202307630A (en) | 2023-02-16 |
| TWI785714B (en) | 2022-12-01 |
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