CN110472615B - Display panel and driving method thereof - Google Patents
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- CN110472615B CN110472615B CN201910779172.6A CN201910779172A CN110472615B CN 110472615 B CN110472615 B CN 110472615B CN 201910779172 A CN201910779172 A CN 201910779172A CN 110472615 B CN110472615 B CN 110472615B
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- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
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Abstract
A display panel and a driving method thereof. The display panel comprises a first secondary display pixel, a fingerprint sensing unit, a second secondary display pixel and a sensing signal output line. The fingerprint sensing unit is configured at the first-time display pixel. The sensing signal output line is electrically connected with the fingerprint sensing unit and extends between the first secondary display pixel and the second secondary display pixel along the first direction. No display data line is arranged between the first sub-display pixel and the second sub-display pixel.
Description
Technical Field
The invention relates to a display panel and a driving method thereof.
Background
The fingerprint is the best biological identification code and has uniqueness. As devices and identification technologies become mature and popular, besides home security access control, personal identification, and identification authentication in payment systems, or places requiring high control of access, in recent years, fingerprint sensing devices are also commonly used in mobile devices for application identification. The conventional fingerprint sensing device utilizes a backlight source to penetrate a photosensitive element to reach a finger, wherein the finger fingerprint has a reflection of peaks and valleys. The photosensitive element receives the reflected light source and detects the difference of the light sources of the wave crests and the wave troughs, and then the sensing of the fingerprint can be carried out.
Disclosure of Invention
The invention provides a display panel and a driving method thereof.
According to an embodiment of the present invention, a display panel is provided, which includes a first sub-display pixel, a fingerprint sensing unit, a second sub-display pixel, and a sensing signal output line. The fingerprint sensing unit is configured at the first-time display pixel. The sensing signal output line is electrically connected with the fingerprint sensing unit and extends between the first secondary display pixel and the second secondary display pixel along the first direction. No display data line is arranged between the first sub-display pixel and the second sub-display pixel.
According to another embodiment of the present invention, a driving method of a display panel is provided, which includes driving a plurality of sub-display pixels with a display scan frequency (Fd) and driving a plurality of fingerprint sensing units with a sensing scan frequency (Fs) during a fingerprint recognition mode. Fs/Fd is less than or equal to 1.
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 circuit diagram of a display panel according to an embodiment.
Fig. 2 is a schematic circuit diagram of a portion of the display panel of fig. 1.
FIG. 3 is a timing waveform for driving a sub-display pixel according to an embodiment.
FIG. 4 shows timing waveforms for driving the fingerprint sensing unit during the fingerprint recognition mode.
FIG. 5 is a timing waveform for driving a sub-display pixel in another embodiment.
Wherein, the reference numbers:
102: display panel
104: pixel
106A: first time display pixel
106B: second time display pixel
106C: third time display pixel
106D: fourth time display pixel
207: sensing element
208、2081、2082: fingerprint sensing unit
211: integrating circuit
C: capacitor with a capacitor element
D1: a first direction
D2: second direction
Gp, Gp _ n + 1: display scanning line
Gs, Gs _ n +1, Gs _ n + 2: sensing scanning line
K. Kn, Kn +1, Kn + 2: sensing signal output line
N1, N2: node point
PG 1: first arrangement sub-pixel group
PG 2: second arrangement sub-pixel group
Q: endpoint
R: red sub-pixel
G: green sub-pixel
B: blue sub-pixel
W: white sub-pixel
S: display data line
SP 1: first group display data line
SP 2: second group display data line
Sn: third display data line
Sn + 1: first display data line
Sn + 2: second display data line
Sn + 3: fourth display data line
Tp: display switch transistor
Tw: sensing switch transistor
Vref: reference potential
Vb: level potential
Δ V1, Δ V2: potential difference
frame: frame period
Detailed Description
The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:
the present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, without departing from the spirit or scope of the present invention.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a "first element," "component," "region," "layer" or "portion" discussed below could be termed a second element, component, region, layer or portion without departing from the teachings herein.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms, including "at least one", unless the content clearly indicates otherwise. "or" means "and/or". As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions integers, steps, operations, elements, components, and/or groups thereof.
As used herein, "about", "approximately", or "substantially" includes the stated value and the average value within an acceptable range of deviation of the specified value as determined by one of ordinary skill in the art, taking into account the measurement in question and the specified amount of error associated with the measurement (i.e., the limitations of the measurement system). For example, "about" may mean within one or more standard deviations of the stated value, or within ± 30%, ± 20%, ± 10%, ± 5%. Further, as used herein, "about", "approximately" or "substantially" may be selected based on optical properties, etch properties, or other properties, with a more acceptable range of deviation or standard deviation, and not all properties may be applied with one standard deviation.
Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present invention and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Exemplary embodiments are described herein with reference to cross-sectional views that are schematic illustrations of idealized embodiments. Thus, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, the embodiments described herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, a region shown or described as flat may generally have rough and/or nonlinear features. Further, the acute angles shown may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the claims.
Fig. 1 is a circuit diagram of a display panel 102 according to an embodiment. In the embodiment, the display panel 102 is a liquid crystal display panel and includes pixels arranged in an array, display data lines S, display scan lines Gp, sensing scan lines Gs, and sensing signal output lines K. The pixels comprise sub-display pixels of different colors, for example comprising a red sub-pixel R, a green sub-pixel G, a blue sub-pixel B, and/or a white sub-pixel W. Taking the pixel 104 shown by a dotted frame as an example, the pixel 104 includes a first sub-display pixel 106A as a white sub-pixel W, a second sub-display pixel 106B as a red sub-pixel R, a third sub-display pixel 106C as a blue sub-pixel B, and a fourth sub-display pixel 106D as a green sub-pixel G. The sub display pixel includes a display switching transistor Tp. The pixel may include a fingerprint sensing unit 208, and the fingerprint sensing unit 208 may be configured in the secondary display pixel. In one embodiment, the fingerprint sensing unit 208 is only disposed in the white sub-pixel W, and does not affect the optical performance of other color sub-pixels, such as the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B, so that the display device has excellent display quality. The white sub-pixel W can be used to control the brightness of the display. The fingerprint sensing unit 208 may include a sensing switch transistor Tw.
The sub display pixels may be arranged in a matrix. In one embodiment, the white sub-pixel W and the green sub-pixel G are alternately arranged in the first direction D1 as a first arrangement sub-pixel group PG 1. The first arrangement sub-pixel group PG1 is disposed at one of an odd position and an even position in the second direction D2, and as illustrated in fig. 1, the first arrangement sub-pixel group PG1 may be arranged at even row positions from the leftmost position to the rightmost position in the second direction D2, that is, at the 2 nd row position, the 4 th row position, the 6 th row position, and the 8 th row position. The red sub-pixel R and the blue sub-pixel B are alternately arranged in the second arrangement sub-pixel group PG2 in the first direction D1. Taking fig. 1 as an example, the second arrangement subpixel group PG2 may be arranged at odd row positions, i.e., the 1 st row position, the 3 rd row position, the 5 th row position and the 7 th row position, from the left to the right, of the second arrangement subpixel group PG 2. The pixels 104 shown in fig. 1 may be arranged in a matrix configuration with the third sub-display pixel 106C (blue sub-pixel B), the first sub-display pixel 106A (white sub-pixel W), the second sub-display pixel 106B (red sub-pixel R), and the fourth sub-display pixel 106D (green sub-pixel G) arranged in sequence along the second direction D2. The pixel definition of the present disclosure is not limited thereto. The first direction D1 is different from the second direction D2, e.g., the first direction D1 may be substantially perpendicular to the second direction D2. In one embodiment, the first direction D1 can be a Y direction, and the second direction D2 can be an X direction. In one embodiment, the first direction D1 can be a row direction, and the second direction D2 can be a column direction.
The sensing signal output line K, including the sensing signal output line Kn, the sensing signal output line Kn +1, the sensing signal output line Kn +2, etc., can extend in the second direction D2 and is electrically connected to the source of the sensing switch transistor Tw of the fingerprint sensing unit 208. Taking the sensing signal output line Kn as shown in fig. 1 as an example, the fingerprint sensing units 208 electrically connected thereto are all located on the same side of the sensing signal output line Kn. The sensing signal output line Kn is disposed between the sub-display pixels (including the first sub-display pixel 106A) in the 2 nd row and the sub-display pixels (including the second sub-display pixel 106B) in the 3 rd row, and no display data line S is disposed between the sub-display pixels in the 2 nd row and the sub-display pixels in the 3 rd row. The sensing signal output line Kn +1 is disposed between the sub-display pixels of the 4 th row and the sub-display pixels of the 5 th row, and no display data line S is disposed between the sub-display pixels of the 4 th row and the sub-display pixels of the 5 th row. This configuration concept can be analogized.
The display data line S may include a first display data line Sn +1, a second display data line Sn +2, a third display data line Sn, a fourth display data line Sn +3, and the like, extending in the first direction D1. The display data lines S include a first group of display data lines SP1 and a second group of display data lines SP 2. The display data lines of the first group of display data lines SP1 include a first display data line Sn +1, a fourth display data line Sn +3, and so on, which are electrically connected to the sources of the display switch transistors Tp of the white subpixel W and the green subpixel G of the first arrangement subpixel group PG 1. The display data lines of the second group of display data lines SP2 include a second display data line Sn +2, a third display data line Sn, and so on, which are electrically connected to the sources of the display switch transistors Tp of the blue subpixel B and the red subpixel R of the second arrangement subpixel group PG 2. As shown in fig. 1, the first display data line Sn +1 is electrically connected to the first arrangement sub-pixel group PG1 at the row 2 position, and includes a first sub-display pixel 106A as a white sub-pixel W in the pixel 104. The second display data line Sn +2 is electrically connected to the second arrangement subpixel group PG2 at the row 3 position, and includes a second subpixel 106B serving as a red subpixel R in the pixel 104. The third display data line Sn is electrically connected to the second arrangement sub-pixel group PG2 at the row 1 position, and includes a third sub-display pixel 106C as a blue sub-pixel B in the pixel 104. The fourth display data line Sn +3 is electrically connected to the first arrangement subpixel group PG1 at the row 4 position, and includes a fourth display pixel 106D of the pixel 104 as a green subpixel G.
A display data line of the first group of display data lines SP1 and a display data line of the second group of display data lines SP2 are arranged in pairs between two adjacent sub-display pixels of the sub-display pixels. In one embodiment, as shown in fig. 1, the first display data line Sn +1 and the third display data line Sn are disposed between the sub-display pixels in the 1 st row and the 2 nd row, and no sensing signal output line K is disposed between the sub-display pixels in the 1 st row and the 2 nd row. The second display data line Sn +2 and the fourth display data line Sn +3 are disposed between the sub-display pixels of the 3 rd row and the 4 th row, and no sensing signal output line K is disposed between the sub-display pixels of the 3 rd row and the 4 th row. The sub-display pixels (including the first sub-display pixel 106A) in the 2 nd row, the sub-display pixels (including the second sub-display pixel 106B) in the 3 rd row, and the sensing signal output line Kn are located between the first display data line Sn +1 and the second display data line Sn + 2. The first display data line Sn +1 and the third display data line Sn are between the first sub-display pixel 106A and the third sub-display pixel 106C. No sensing signal output line K is arranged between the first sub-display pixel 106A and the third sub-display pixel 106C. The concept of a configuration can be analogized.
The display scan line Gp, including the display scan line Gp _ n, the display scan line Gp _ n +1, and the like, may extend in the second direction D2 and be electrically connected to the gate of the display switch transistor Tp of the sub-display pixel, so as to control the turn-on timing of the sub-display pixel. The sensing scan line Gs, including the sensing scan line Gs _ n, the sensing scan line Gs _ n +1, the sensing scan line Gs _ n +2, and the like, may extend in the second direction D2 and be electrically connected to the gate of the sensing switch transistor Tw of the fingerprint sensing unit 208, so as to control the turn-on timing of the fingerprint sensing unit 208. The display scanning line Gp and the sensing scanning line Gs are arranged in pairs between two adjacent sub-display pixels. As shown in fig. 1, the display scanning line Gp and the sensing scanning line Gs are arranged in pairs between the sub-display pixels of the 1 st column and the 2 nd column from the top to the bottom in the first direction D1, or in pairs between the sub-display pixels of the 2 nd column and the 3 rd column, and so on.
In one embodiment, the display panel 102 is a liquid crystal display panel, and can be assembled with a backlight (not shown) to form a display device. The display switch transistor Tp of the sub-display pixel of the display panel 102, the sensing switch transistor Tw of the fingerprint sensing unit 208, the sensing signal output line K, the display data line S, the display scan line Gp, and the sensing scan line Gs are disposed on one substrate (e.g., a thin film transistor substrate) closer to the backlight side, the color filter is disposed on the other substrate (e.g., a color filter substrate) farther from the backlight side, and the liquid crystal layer is sandwiched between the two substrates. The display panel 102 according to the embodiment concept can implement real on-screen fingerprint recognition. In one embodiment, the sub-display pixels can be defined by substantially interlaced display scan lines Gp and display data lines S. In another embodiment, the sub-display pixels can be defined by the regions where the active devices (or the display switch transistors Tp) and the corresponding electrically connected pixel electrodes (not shown) are located, respectively, instead of the display data lines S and the display scan lines Gp. The drain of the display switching transistor Tp may be electrically connected to the pixel electrode.
Fig. 2 is a partial circuit diagram of the display panel 102. Referring to fig. 1 and fig. 2, the fingerprint sensing unit 208 includes a fingerprint sensing unit 2081, a fingerprint sensing unit 2082, and the like. The fingerprint sensing unit 2081 is electrically connected between the sensing signal output line Kn and the sensing scanning line Gs _ n + 1. The fingerprint sensing unit 2082 is electrically connected between the sensing signal output line Kn +1 and the sensing scanning line Gs _ n + 2. And so on for the other fingerprint sensing units 208. The fingerprint sensing unit 208 (or the fingerprint sensing unit 2081, 2082) may include a sensing switch transistor Tw, a capacitor C, and a sensing element 207. The sensing element 207 may be a touch sensor. The node N1 is located between the drain of the sensing switch transistor Tw of the fingerprint sensing unit 2081, the capacitor C, and the sensing element 207. The capacitor C of the fingerprint sensing unit 2081 and the sensing element 207 are electrically connected in parallel between the node N1 and the node Q. The node N2 is located between the drain of the sensing switch transistor Tw of the fingerprint sensing unit 2082, the capacitor C, and the sensing element 207. The capacitor C of the fingerprint sensing unit 2081 and the sensing element 207 are electrically connected in parallel between the node N2 and the node Q. And so on for the other fingerprint sensing units 208. The sensing signal output line K, including the sensing signal output line Kn, the sensing signal output line Kn +1, etc., may be electrically connected to the integrating circuit 211, and the integrating circuit 211 may be an external integrating circuit.
In an embodiment, the driving method of the display panel 102 can be understood by referring to fig. 3 and the signal timing diagram of fig. 4, where fig. 3 is a driving timing waveform associated with the sub-display pixels, and fig. 4 is a driving timing waveform associated with the fingerprint sensing unit 208 during the fingerprint identification mode.
Referring to fig. 3, the driving method of the display panel 102 includes providing display scan signals to the display scan lines Gp to drive the display scan lines Gp (for example, fig. 3 shows the display scan signals provided to the display scan lines Gp _ n and Gp _ n + 1), and providing display data signals to the display data lines S (for example, fig. 3 shows the display data signals provided to the first display data lines Sn +1 and the third display data lines Sn), so as to drive the sub-display pixels and control the bright and dark states of the sub-display pixels. When the display switch transistor Tp is turned on (i.e., the polarity of the channel under the gate is the same as that of the source/drain), the display data signal can be written into the sub-display pixel. In one embodiment, the display data signal may include a first display data signal and a second display data signal. The first display data signal may be a data display signal provided to a first group of display data lines SP1 electrically connecting the white sub-pixel W and the green sub-pixel G, such as the display data signal provided to the first display data line Sn +1 shown in fig. 3. The second display data signal may be a data display signal provided to a second group of display data lines SP2 electrically connecting the red and blue subpixels R and B, such as the display data signal provided to the third display data line Sn shown in fig. 3. In one embodiment, the display scan signal and the display data signal may be controlled to display an image with the sub-display pixels during a display mode (i.e., a display image mode and/or a touch sensing period of non-fingerprint sensing/recognition) and to control the bright and dark states of the sub-display pixels during a fingerprint recognition mode, thereby displaying the image. In one embodiment, during the display mode, the sensing switch transistor Tw is maintained in an off state, and the display panel 102 does not perform the fingerprint sensing function. In one embodiment, the display scan lines Gp may be driven one by one with the display scan signal during a frame period (frame) during the fingerprint recognition mode and the display mode. During the display mode, the first display data signal and the second display data signal can be maintained at a bright state voltage (e.g., a white frame gray scale signal). During the fingerprint identification mode, the first display data signal may have a pulse frequency, the pulse frequency of the first display data signal may be greater than the display scan frequency (Fd) of the display scan signal, and the second display data signal may be maintained at a dark-state voltage (e.g., a black frame gray-scale signal), such that only at least one of the white subpixel W and the green subpixel G is driven to a bright state, e.g., only the white subpixel W is driven to a bright state (at which time the red subpixel R, the green subpixel G, and the blue subpixel B are driven to a dark state), and the display brightness may change accordingly; alternatively, only the green sub-pixel G is driven to be in the bright state (in this case, the white sub-pixel W, the red sub-pixel R, and the blue sub-pixel B are in the dark state).
Referring to fig. 4, in an embodiment, the waveform timing of fig. 4 may be utilized to drive the white sub-pixel W to be in a bright state during the fingerprint identification mode, i.e., the liquid crystal tilt orientation of the white sub-pixel W allows light to pass therethrough, so that the light from the backlight source can pass through the liquid crystal layer of the white sub-pixel W and then be reflected into the fingerprint sensing unit 208 of the white sub-pixel W by the fingerprint. Sensing fingerprint identification during the white sub-pixel W is in a bright state can result in excellent fingerprint identification quality. The brightness of the display image during the fingerprint identification period can be regulated and controlled by the white sub-pixel W in the bright state.
In another embodiment, a driving method of the display panel 102 can be understood with reference to fig. 4 and the signal timing diagram of fig. 5, wherein fig. 5 is a driving timing waveform associated with the sub-display pixels.
In one embodiment, the waveform timing of FIG. 5 may be utilized to drive the green sub-pixel G to be in a bright state during the fingerprint identification mode, i.e., the liquid crystal tilt orientation of the green sub-pixel G allows light to pass therethrough, so that light from the backlight source can pass through the liquid crystal layer of the green sub-pixel G, then pass through the green filter layer to filter light emitting in the green wavelength band, and reflect light in the green wavelength band through the fingerprint to the fingerprint sensing unit 208 of the white sub-pixel W. In the embodiment, the light of the green light wave band has higher absorptivity for the blood of the human body, so that the light can be used for personal characteristic value identification to achieve the anti-counterfeiting effect.
The driving method of the display panel 102 includes providing a sensing scan signal to the sensing scan line Gs to drive the sensing scan line Gs and further to drive the fingerprint sensing unit 208, and reading a fingerprint sensing output signal output from the sensing signal output line K during the fingerprint identification mode. The sensing scanning lines Gs are driven one by one with the sensing scanning signals during each frame period. In an embodiment, during the period when the sensing switch transistor Tw is turned on (i.e., during the reading period of the integration circuit 211), the integration circuit 211 charges the reference potential Vref to the node of the fingerprint sensing unit 208 (e.g., the node N1 of the fingerprint sensing unit 2081 and the node N2 of the fingerprint sensing unit 2082). The terminals of the fingerprint sensing unit 208 (e.g., the terminal Q of the fingerprint sensing unit 2081, the terminal Q of the fingerprint sensing unit 2082) have a level potential Vb. When the sensing switch transistor Tw is turned off, the sensing element 207 gradually leaks to the level potential Vb due to the light reflected by the finger. The potential difference between the reference potential Vref and the level potential Vb varies with the intensity of the reflected light from the peak or the trough of the fingerprint. In one embodiment, as shown in fig. 4, the potential difference Δ V1 sensed by the fingerprint sensing unit 2081 electrically connecting the sensing scan line Gs _ N +1 and the sensing signal output line Kn is the potential difference between the reference potential Vref and the level potential Vb at the node N1, and the potential difference Δ V2 sensed by the fingerprint sensing unit 2082 electrically connecting the sensing scan line Gs _ N +2 and the sensing signal output line Kn +1 is different from Δ V1, i.e., Δ V1> Δ V2, where Δ V1 may represent a fingerprint peak signal and Δ V2 may represent a fingerprint valley signal.
The display scan signal supplied to the display scan line Gp has a display scan frequency (Fd). The sensing scan signal supplied to the sensing scan line Gs during the fingerprint recognition mode has a sensing scan frequency (Fs). Fs/Fd is less than or equal to 1. Alternatively, Fs/Fd < 1. The sub-display pixels have a display opening area (Ad), and the fingerprint sensing unit 208 has a sensing area (As). In one embodiment, the fingerprint sensing unit 208 may further include a light sensing element (not shown). When the fingerprint sensing unit 208 operates, the light sensing device can receive light and correspondingly output a fingerprint sensing signal through the sensing switch transistor Tw. In one embodiment, the sensing switch transistor Tw is electrically connected between the photosensitive element and the sensing signal output line K. The photosensitive element and the sensing signal output line K are respectively electrically connected to the drain and the source of the sensing switch transistor Tw. The sensing area (As) may be the total area of the photosensitive device and the sensing switch transistor Tw. In one embodiment, As/Ad ≦ 1. In one embodiment, 1/4 is equal to or greater than As/Ad is equal to or less than 1/3, and 1/2 is equal to or greater than Fs/Fd is equal to or less than 3/4. For example As/Ad 1/4 and Fs/Fd 1/2. For example As/Ad 1/3 and Fs/Fd 3/4.
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 (8)
1. A display panel, comprising:
displaying the pixel for the first time;
a fingerprint sensing unit disposed in the first sub-display pixel;
displaying the pixel for the second time; and
a sensing signal output line electrically connected to the fingerprint sensing unit and extending between the first sub-display pixel and the second sub-display pixel along a first direction,
wherein no display data line is disposed between the first sub-display pixel and the second sub-display pixel, the display panel is a liquid crystal display panel and includes a plurality of sub-display pixels, the sub-display pixels include a plurality of white sub-pixels, a plurality of red sub-pixels, a plurality of green sub-pixels, and a plurality of blue sub-pixels, wherein the white sub-pixels and the green sub-pixels are alternately disposed in a first arrangement sub-pixel group in the first direction, the red sub-pixels and the blue sub-pixels are alternately disposed in a second arrangement sub-pixel group in the first direction, the first arrangement sub-pixel group is disposed in one of an odd position and an even position in a second direction, the second arrangement sub-pixel group is disposed in the other of the odd position and the even position, and the first direction is different from the second direction;
a plurality of fingerprint sensing units, wherein among the sub-display pixels, only the white sub-pixels have the fingerprint sensing units arranged therein;
a first group of display data lines extending in the first direction and electrically connected to the white sub-pixels and the green sub-pixels of the first arrangement sub-pixel group;
a second group of display data lines extending in the first direction and electrically connecting the blue sub-pixels and the red sub-pixels of the second arrangement sub-pixel group, wherein the display data lines of the first group of display data lines and the display data lines of the second group of display data lines are arranged in pairs between two adjacent sub-display pixels of the sub-display pixels;
a plurality of display scanning lines extending in the second direction and electrically connected to the sub-display pixels;
a plurality of sensing scanning lines extending in the second direction and electrically connected to the fingerprint sensing units, wherein one of the display scanning lines and one of the sensing scanning lines are paired between two adjacent sub-display pixels of the sub-display pixels; and
and the fingerprint sensing units electrically connected with one of the sensing signal output lines are all positioned on the same side of the one sensing signal output line.
2. The display panel of claim 1, comprising a plurality of pixels arranged in an array, each of the pixels comprising a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel, the display panel comprising a first display data line, only the white sub-pixels and the green sub-pixels of the pixels being electrically connected to the first display data line.
3. The display panel of claim 1, comprising:
a first display data line electrically connected to the first sub-display pixel and extending along the first direction; and
a second display data line electrically connected to the second sub-display pixel and extending along the first direction,
the first sub-display pixel, the second sub-display pixel and the sensing signal output line are arranged between the first display data line and the second display data line.
4. The display panel according to claim 3, comprising:
a third sub-display pixel, wherein the third sub-display pixel, the first sub-display pixel and the second sub-display pixel are sequentially arranged in the second direction; and
and a third display data line electrically connected to the third sub-display pixel, wherein the first display data line and the third display data line are between the first sub-display pixel and the third sub-display pixel.
5. The display panel according to claim 4, wherein no sensing signal output line is arranged between the first sub-display pixel and the third sub-display pixel.
6. A driving method of the display panel according to claim 1, comprising:
during a fingerprint identification mode, a display scan frequency (Fd) is used to drive a plurality of sub-display pixels, and a sensing scan frequency (Fs) is used to drive a plurality of fingerprint sensing units, wherein Fs/Fd is less than or equal to 1.
7. The method as claimed in claim 6, wherein only at least one of the white sub-pixel and the green sub-pixel is driven to be in a bright state during the fingerprint recognition mode.
8. The method as claimed in claim 6, wherein the method comprises driving the plurality of display scan lines one by one with a display scan signal during a display mode and during the fingerprint identification mode, providing a first display data signal to one display data line electrically connecting the plurality of white sub-pixels and the plurality of green sub-pixels, and providing a second display data signal to another display data line electrically connecting the plurality of red sub-pixels and the plurality of blue sub-pixels,
wherein during the fingerprint identification mode, a plurality of sensing scan lines electrically connected to the fingerprint sensing units are driven one by a sensing scan signal, and sensing switch transistors of the fingerprint sensing units are turned on, and during the period when the sensing switch transistors are in an on state, a fingerprint sensing output signal output from a sensing signal output line is read, wherein a pulse frequency of the first display data signal is greater than the display scan frequency (Fd), the second display data signal is maintained at a dark state voltage, and only one of the white sub-pixel and the green sub-pixel is in a bright state,
during the display mode, the first display data signal and the second display data signal are maintained at a bright state voltage.
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| TW108104673A TWI688890B (en) | 2019-02-12 | 2019-02-12 | Display panel and driving method for the same |
| TW108104673 | 2019-02-12 |
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| CN114005373B (en) * | 2020-07-16 | 2023-11-03 | 敦泰电子股份有限公司 | Fingerprint display device and integrated circuit for driving same |
| TWI736391B (en) * | 2020-08-10 | 2021-08-11 | 宏碁股份有限公司 | Display structure including under-screen lens and display panel |
| TWI766569B (en) * | 2020-09-15 | 2022-06-01 | 大陸商廣州印芯半導體技術有限公司 | Image sensing method |
| CN113109954B (en) * | 2021-04-02 | 2022-03-08 | 深圳市华星光电半导体显示技术有限公司 | Display panel and display device |
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| TWI688890B (en) | 2020-03-21 |
| CN110472615A (en) | 2019-11-19 |
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