CN111028770A - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN111028770A CN111028770A CN202010001443.8A CN202010001443A CN111028770A CN 111028770 A CN111028770 A CN 111028770A CN 202010001443 A CN202010001443 A CN 202010001443A CN 111028770 A CN111028770 A CN 111028770A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
The embodiment of the application provides a display panel, a display unit comprises a first transistor and a display pixel, and a light sensation identification unit comprises a second transistor and a light sensation device. The first shift register unit comprises a first shift register which is cascaded and is electrically connected with the first scanning line to control the first transistor; the second shift register unit comprises a second shift register and a second scanning line which are in cascade connection, wherein the second shift register and the second scanning line are electrically connected to control the second transistor. The first stage shift register of the first shift register unit and the first stage shift register of the second shift register unit are connected with the same frame scanning starting signal line. In the display stage, the first scanning line controls the first transistor to be turned on, and the second scanning line controls the second transistor to be turned off; in the stage of light sensation identification, the first scanning line controls the first transistor to be closed, and the second scanning line controls the second transistor to be opened. Because the display unit and the light sensation identification unit share the data line and the frame scanning starting signal line, the space is saved, and the reliability of the signal is ensured.
Description
[ technical field ] A method for producing a semiconductor device
The application relates to the technical field of display, in particular to a display panel and a display device.
[ background of the invention ]
Currently, along with the increasing awareness of consumers on information security, biometric identification technologies such as fingerprint identification and face identification become research hotspots. Taking fingerprint identification technology as an example, the method has the advantages of high precision, high speed, low price, high user acceptance and the like, and is widely applied to the field of personal identity verification.
Mobile devices such as mobile phones and tablets for display become an indispensable part of life of people, and store much personal information. Therefore, how to effectively apply the biometric technology to the display terminal device becomes a research focus.
[ application contents ]
In view of the above, embodiments of the present application provide a display panel and a display device to solve the above problems.
In a first aspect, the present application provides a display panel, which includes a plurality of display units arranged in an array, a plurality of light sensing identification units arranged in an array, a first shift register unit, and a second shift register unit. The display units comprise first transistors and display pixels, the grid electrodes of the first transistors are electrically connected with the first scanning lines, the source electrodes of the first transistors are electrically connected with the data lines, and the drain electrodes of the first transistors are electrically connected with the display pixels. The light sensation identification unit comprises a second transistor and a light sensation device, wherein the grid electrode of the second transistor is electrically connected with the second scanning line, and the source electrode of the second transistor and the data line are electrically connected with the drain electrode of the second transistor and the light sensation device. The first shift register unit comprises a first shift register which is cascaded, and the first shift register is electrically connected with the first scanning line; the second shift register unit comprises a second shift register in cascade connection, and the second shift register is electrically connected with the second scanning line. The first stage shift register of the first shift register unit and the first stage shift register of the second shift register unit are connected with the same frame scanning starting signal line. In the display stage, the first scanning line controls the first transistor to be turned on, the second scanning line controls the second transistor to be turned off, and the data line transmits a display signal; in the light sensation identification stage, the first scanning line controls the first transistor to be closed, the second scanning line controls the second transistor to be opened, and the data line transmits a light sensation identification signal.
In one implementation manner of the first aspect, the display panel further includes a plurality of multiplexing units, a display IC, and a light sensing identification IC. One end of the multi-path selection unit is electrically connected with the data line, and the other end of the multi-path selection unit is electrically connected with the display IC and the fingerprint identification IC at the same time. In the display stage, the multi-path selection unit transmits a display signal of the display IC to the data line; in the light sensing identification stage, the light sensing identification signal is transmitted between the light sensing identification IC and the data line through the multi-path selection unit.
In one implementation form of the first aspect, the display panel includes an integrated IC, the data line being electrically connected to the integrated IC; in the display stage, the integrated IC outputs display signals to the data lines; in the light sensing identification stage, a light sensing identification signal is transmitted between the integrated IC and the data line.
In one implementation form of the first aspect, the light sensing device is a photodiode, and is configured to convert an optical signal into a light sensing electrical signal; the light sensation identification unit is used for fingerprint identification.
In one implementation manner of the first aspect, the light sensation identification signal includes an initialization signal and a light sensation electrical signal, and the light sensation identification stage includes: in the initialization stage, the first scanning line controls the first transistor to be closed, the second scanning line controls the second transistor to be opened, and the data line transmits an initialization signal to the photodiode; in the integration stage, a second scanning signal line controls the second transistor to be closed, and the photodiode integrates the optical signal and converts the optical signal into an electric signal; in the reading stage, the first scanning line controls the first transistor to be closed, the second scanning line controls the second transistor to be opened, and the data line transmits a light sensing signal generated by the photodiode.
In one implementation of the first aspect, a part of the stages of the light sensation identification stage is located between two adjacent display stages.
In an implementation manner of the first aspect, in the initialization stage, the integration stage, and the reading stage of the same light sensation identification stage, the initialization stage is located between two adjacent display stages, the reading stage is located between another two adjacent display stages, and the integration stage is located between the initialization stage and the reading stage.
In one implementation manner of the first aspect, in two adjacent light sensation identification stages, the read stage of the previous light sensation identification stage and the initialization stage of the other light sensation identification stage are located between the same two display stages.
In one implementation manner of the first aspect, the light sensing identification unit further includes a storage capacitor; the drain electrode of the second transistor is electrically connected with the cathode of the photodiode and the first polar plate of the storage capacitor; the anode of the photodiode and the second plate of the storage capacitor are connected with a grounding signal.
In one implementation manner of the first aspect, the light sensing identification unit further includes a storage capacitor, a third transistor, a fourth transistor, and a fifth transistor. The drain electrode of the second transistor is electrically connected with the cathode of the photodiode; the first polar plate of the storage capacitor is electrically connected with the source electrode of the second transistor, and the second polar plate of the storage capacitor and the anode of the photodiode are connected with a grounding signal; the grid electrode of the third transistor is electrically connected with the reset starting signal wire, the drain electrode of the third transistor is electrically connected with the source electrode of the second transistor, and the source electrode of the third transistor is electrically connected with the data wire; the grid electrode of the fourth transistor is electrically connected with the source electrode of the second transistor, and the drain electrode of the fourth transistor is electrically connected with the source electrode of the fifth transistor; a gate of the fifth transistor is electrically connected to the selection signal line, and a drain of the fifth transistor is electrically connected to the data line.
In one implementation manner of the first aspect, in an initialization stage, the reset start signal line transmits a reset start signal to a gate of the third transistor, and controls the third transistor to be turned on; the initialization signal is transmitted to the photodiode through the third transistor and the second transistor; in a reading stage, the selection signal line transmits a selection signal to the grid electrode of the fifth transistor to control the fifth transistor to be opened; the photosensitive signal is read by the data line through the fourth transistor and the fifth transistor.
In one implementation manner of the first aspect, the plurality of display units include a first display unit, a second display unit, and a third display unit that are adjacently disposed in sequence. The source electrode of the third transistor and the source electrode of the fourth transistor share a data line with the source electrode of the first transistor corresponding to the first display unit; a reset starting signal line connected with the grid electrode of the third transistor shares a data line with the source electrode of the first transistor corresponding to the second display unit; the drain electrode of the fifth transistor shares a data line with the source electrode of the corresponding first transistor in the third display unit.
In a second aspect, embodiments of the present application further provide a display device, which includes the display panel provided in the first aspect.
In the display panel and the display device provided by the embodiment of the application, the light sensation identification unit and the display unit share the data line, namely, the light sensation identification unit is arranged in the display area, and the number of signal lines additionally arranged on the light sensation identification unit is reduced; in addition, the shift registers corresponding to the light sensing identification unit and the display unit share the frame scanning starting signal, so that the light sensing identification is realized in the process of displaying a frame of picture, and the precision of the light sensing identification and the synchronism of the display are improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic view of a display panel provided in an embodiment of the present application;
FIG. 2 is a schematic view of a display panel provided in another embodiment of the present application;
FIG. 3 is a timing diagram illustrating an operation of a display panel according to an embodiment of the present application;
FIG. 4 is a timing diagram illustrating an operation of a display panel according to another embodiment of the present application;
FIG. 5 is a schematic view of a light-sensing identification unit according to an embodiment of the present application;
FIG. 6 is a schematic view of a light-sensing identification unit according to another embodiment of the present application;
FIG. 7 is a schematic view of a light-sensing identification unit according to another embodiment of the present application;
fig. 8 is a timing diagram illustrating an operation of a display panel according to still another embodiment of the present application.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.
It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
In the description herein, it is to be understood that the terms "substantially", "approximately", "about", "substantially", and the like, as used in the claims and the examples herein, are intended to be generally accepted as not being precise, within the scope of reasonable process operation or tolerance.
It should be understood that although the terms first, second, third, etc. may be used to describe the display regions in the embodiments of the present application, the display regions should not be limited to these terms. These terms are only used to distinguish the display areas from each other. For example, the first display region may also be referred to as a second display region, and similarly, the second display region may also be referred to as a first display region without departing from the scope of the embodiments of the present application.
The applicant provides a solution to the problems of the prior art through intensive research.
Referring to fig. 1 and 2, fig. 1 is a schematic view of a display panel provided in an embodiment of the present application, and fig. 2 is a schematic view of a display panel provided in another embodiment of the present application, where as shown in fig. 1 and 2, the display panel includes a plurality of display units 01 arranged in an array, a plurality of light sensing identification units 02 arranged in an array, a first shift register unit 03, and a second shift register unit 04.
Specifically, as shown in fig. 1 and fig. 2, each of the display units 01 includes a first transistor 12 and a display pixel 11, a Gate of the first transistor 12 is electrically connected to a first scan line Gate1/Gate2/Gate3/Gate4, a source of the first transistor 12 is electrically connected to a data line S11/S12/S13/S11 '/S12 '/S13 ', and a drain of the first transistor 12 is electrically connected to the display pixel 11;
specifically, as shown in fig. 1 and 2, the light sensing identification unit 02 includes a second transistor 22 and a light sensing device 21, a Gate of the second transistor 22 is electrically connected to the second scan line Gate1 '/Gate 2 '/Gate 3 '/Gate 4 ', a source of the second transistor 22 is electrically connected to the data line S13/S13 ', and a drain of the second transistor 22 is electrically connected to the light sensing device 21.
For clarity of description of the invention points of the present application, the embodiments of the present application only take 6 × 4 display cells 01 and 2 × 4 light sensing and recognizing units 02 as examples for description, the embodiments of the present application are not particularly limited to the number of the display cells 01 and the light sensing and recognizing units 02, and accordingly, the embodiments of the present application are not particularly limited to the number of devices included in the display panel described below. In addition, in the embodiment of the present application, each three display units 01 corresponds to one light sensing identification unit 02, but the specific mixture ratio of the display units 01 and the light sensing identification units is not limited in the present application.
Specifically, as shown in fig. 1 and 2, the first shift register unit 03 includes a cascade of first shift registers 31, and the first shift registers 31 are electrically connected to the first scan lines Gate1/Gate2/Gate3/Gate 4. The second shift register unit 04 includes a cascade of second shift registers 41, and the second shift registers 41 are electrically connected to the second scan lines Gate1 '/Gate 2'/Gate 3 '/Gate 4'.
The first stage shift register 31 of the first shift register unit 03 and the first stage shift register 41 of the second shift register unit 04 are connected to the same frame scanning start signal line STV. That is, the first shift register unit 03 and the second shift register unit 04 receive the signal on the frame scanning start signal line STV at the same time.
In addition, the first shift register 31 in the first shift register unit 03 is further connected to the first pulse signal line CKV1 and the second pulse signal line CKV2, and the first pulse signal line CKV1 and the second pulse signal line CKV2 are sequentially and alternately inputted to different ends of the first shift register 31. That is, the first pulse signal line CKV1 and the second pulse signal line CKV2 are respectively inputted to the first end and the second end of the first stage of the first shift register 31, the first pulse signal line CKV1 and the second pulse signal line CKV2 are respectively inputted to the second end and the first end of the second stage of the first shift register 31, the first pulse signal line CKV1 and the second pulse signal line CKV2 are respectively inputted to the first end and the second end of the third stage of the first shift register 31, and the first pulse signal line CKV1 and the second pulse signal line CKV2 are respectively inputted to the second end and the first end of the fourth stage of the first shift register 31. As such, the gates 1-4 may sequentially receive the first scan signal for controlling the turning on and off of the first transistor 12.
In addition, the first shift register 41 in the second shift register unit 04 is further connected to the third pulse signal line CKV3 and the third pulse signal line CKV4, and the third pulse signal line CKV3 and the fourth pulse signal line CKV4 are sequentially and alternately inputted to different ends of the second shift register 41, that is, the third pulse signal line CKV3 and the fourth pulse signal line CKV4 are respectively inputted to the first end and the second end of the first-stage second shift register 41, the third pulse signal line CKV3 and the fourth pulse signal line CKV4 are respectively inputted to the second end and the first end of the second-stage second shift register 41, the third pulse signal line CKV3 and the fourth pulse signal line CKV4 are respectively inputted to the first end and the second end of the third-stage second shift register 41, and the third pulse signal line CKV3 and the fourth pulse signal line CKV4 are respectively inputted to the second end and the first end of the fourth-stage second shift register 41. As such, the Gate1 '-Gate 4' may sequentially receive the second scan signal for controlling the turning on and off of the second transistor 22.
Referring to fig. 3 and 4, fig. 3 is a timing diagram of the display panel according to an embodiment of the present application, and fig. 4 is a timing diagram of the display panel according to another embodiment of the present application, as shown in fig. 3 and 4, when the valid signal is inputted to the frame scanning start signal line STV and then the valid signal is inputted again for displaying a frame, in the period, the first scan lines Gate1 and Gate3 in the odd-numbered rows receive the valid signal when the valid signal is inputted to the CKV1, and the first scan lines Gate2 and Gate4 in the even-numbered rows receive the valid signal when the valid signal is inputted to the CKV 2; in this period, the first scan lines Gate1 'and Gate 3' of the odd-numbered rows receive the active signal when the CKV3 inputs the active signal, and the first scan lines Gate2 'and Gate 4' of the even-numbered rows receive the active signal when the CKV4 inputs the active signal.
Specifically, in the display phase, the first scan line Gate1/Gate2/Gate3/Gate4 controls the first transistor 12 to be turned on, the second scan line Gate1 '/Gate 2 '/Gate 3 '/Gate 4 ' controls the second transistor 22 to be turned off, and the data line S11/S12/S13/S11 '/S12 '/S13 ' transmits a display signal. More specifically, the first scan lines Gate1-Gate4 sequentially control the first transistors 12 of different rows to be turned on.
Specifically, in the light sensing identification phase, the first scan line Gate1/Gate2/Gate3/Gate4 controls the first transistor 12 to be turned off, the second scan line Gate1 '/Gate 2 '/Gate 3 '/Gate 4 ' controls the second transistor 22 to be turned on, and the data line S13/S13 ' transmits the light sensing identification signal. More specifically, the second scan lines Gate1 '-Gate 4' sequentially control the second transistors 22 of different rows to be turned on.
Because the display unit 01 and the light sensation identification unit 02 share the data line, the number of signal lines in the display area can be reduced, the design difficulty is reduced, and the display effective area is increased. Meanwhile, the first shift register and the second shift register share the frame scanning initial signal line, and the fingerprint identification stage is inserted in one frame display, so that the common frame scanning initial signal line can reduce the number of signal lines to realize a narrow frame, and can ensure that the light sensing identification is synchronous with the frame display when the frame display is started.
In one embodiment of the present application, referring to fig. 1, the display panel includes an integrated IC05, which is an IC providing both the display signal and the light sensing identification signal. Specifically, the data lines S11/S12/S13/S11 '/S12 '/S13 ' are electrically connected to the integrated IC 05. In the display stage, the integrated IC05 outputs display signals to the data lines S11/S12/S13/S11 '/S12 '/S13 '; in the light sensing stage, a light sensing identification signal is transmitted between the integrated IC05 and the data lines S13/S13'.
More specifically, with continued reference to fig. 1, the display panel further includes a selection switch 06 disposed between the integrated IC05 and the data lines S11/S12/S13/S11 '/S12 '/S13 ' for controlling the display signal/light-sensing identification signal output by the integrated IC05 to be transmitted to a specific one of the data lines. Taking the left selection switch 06 in fig. 1 as an example, when the integrated IC05 outputs the display signal, the selection switch 06 controls one of the display signal transmission data lines S11/S12/S13.
In an embodiment of the present application, referring to fig. 2, the display panel further includes a plurality of multiplexing units 07, a display IC05 a, and a light sensing identification IC05 b. Specifically, one end of the multiplexer 07 is electrically connected to the data lines S11, S12, S13/S11 ', S12 ', S13 ', and the other end is electrically connected to the display IC05 a and the fingerprint recognition IC05 b. The display IC05 a is used for outputting display signals, and the light sensing identification IC05b is used for outputting and/or receiving and processing light sensing identification signals.
In the display stage, the multiplexing unit 07 transmits the display signal of the display IC05 a to the data lines S11/S12/S13/S11 '/S12 '/S13 '; in the light sensing stage, a light sensing identification signal is transmitted between the light sensing identification IC and the data lines S13/S13' through the multiplexing unit 07.
More specifically, with continued reference to fig. 2, the display panel further includes a selection switch 06 disposed between the display IC05 a, the light sensing IC05b and the data lines S11/S12/S13/S11 '/S12 '/S13 ' for transmitting the display signal output by the display IC05 a or the light sensing signal output by the light sensing IC05b to a specific one of the data lines.
More specifically, the light sensing device 21 is a photodiode for converting an optical signal into a light sensing signal, and the light sensing identification unit is used for fingerprint identification. That is to say, the display panel provided by the embodiment of the application can be used for displaying and fingerprint identification.
Correspondingly, referring to fig. 3 and 4, since the data line S13 is connected to both the display unit 01 and the light sensing identification unit 02 in the example of the embodiment of the present application, the signal of the data line S13 is taken as a representative in fig. 3 and 4. In fig. 3 and 4, for convenience of explanation of the invention, a high level signal in each signal line indicates an effective signal, for example, a signal for turning on a transistor, displaying, or performing light sensing, and signals at different heights in the same signal line indicate different signals.
In addition, the light sensing identification signal specifically includes an initialization signal and a light sensing electrical signal, where the initialization signal is a signal for initializing the light sensing device 21, and the light sensing electrical signal is a signal converted by the light sensing device 21 after receiving the light signal.
The light sensation identification stage comprises an initialization stage, an integration stage and a reading stage. As shown in fig. 3 and 4, the initialization stage is a stage in which the data line S13 receives an initialization signal FR1 for initializing the photosensitive device 21; in the reading stage, the data line S13 receives the light-sensing signal FR2 in the light-sensing device to determine the intensity, form, etc. of the light signal; the integration stage is a stage between the initialization stage and the reading stage in the light sensing identification stage, the light sensing device 21 is isolated from various signals, and the light sensing device 21 receives the light signals and converts the light signals into light sensing electric signals.
It should be noted that, in order to distinguish the initialization signal FR1 from the photo electric signal FR2, the two signals are represented as different heights, so the initialization signal FR1 and the photo electric signal FR2 with different heights in the embodiment of the present application do not represent the signal intensities of the two signals.
Specifically, referring to fig. 1-4, in the initialization stage, the first scan line Gate1-Gate4 controls the first transistor 12 to be turned off, the second scan line Gate1 '-Gate 4' controls the second transistor to be turned on 22, and the data line S13 transmits the initialization signal FR1 to the photo-sensitive device 21, such as a photodiode.
Specifically, referring to fig. 1-4, in the integration phase, the second scan signal line Gate1 '-Gate 4' controls the second transistor 22 to be turned off, the light sensing device 21 is isolated from the external signal line, and the light sensing device 21, such as a photodiode, integrates the optical signal and converts it into an electrical signal;
specifically, referring to fig. 1-4, in the reading stage, the first scan line Gate1-Gate4 controls the first transistor 12 to be turned off, the second scan line Gate1 '-Gate 4' controls the second transistor 22 to be turned on, and the data line transmits the photo sensing signal FR2 generated by the photodiode.
Further, part of the light sensation identification stage is positioned between two adjacent display stages.
In the initialization stage, the integration stage and the reading stage of the same light sensation identification stage, the initialization stage is positioned between two adjacent display stages, the reading stage is positioned between the other two adjacent display stages, and the integration stage is positioned between the initialization stage and the reading stage.
Specifically, as shown in fig. 3 and 4, the process of S13 receiving the display signal DT belongs to the display phase, the process of S13 receiving the initialization signal FR1 and/or receiving the photo-electric signal FR2 belongs to the photo-sensing identification phase, more specifically, the process of S13 receiving the initialization signal FR1 belongs to the initialization phase, the process of S13 receiving the photo-electric signal FR2 belongs to the reading phase, and the phase after the initialization phase and before the reading phase is the integration phase. As shown in fig. 3 and 4, the initialization phase of S13 receiving the initialization signal FR1 is between two display phases of S13 receiving the display signal DT, and the photo sensing identification phase of S13 receiving the photo sensing signal FR2 is between two display phases of S13 receiving the display signal DT.
Specifically, as shown in fig. 3, the initialization phase of S13 receiving the initialization signal FR1 is located between two display phases of S13 receiving the display signal DT, and the light sensing identification phase of S13 receiving the light sensing electric signal FR2 is located between two other display phases of S13 receiving the display signal DT.
More specifically, as shown in fig. 3, the initialization phase of the light sensation identification phase is inserted between the display phases in one frame of display, and the reading phase of the light sensation identification phase is inserted between the display phases in another adjacent frame of display. As shown in fig. 3, the frame scanning start signal line STV is used for displaying a frame before receiving a start signal and then receiving another start signal, and the display stages of the first frame display are interspersed with the initialization stage of the light sensing identification stage, and the display stages of the second frame display are interspersed with the reading stage of the light sensing identification stage. That is, the initialization stage of all the light sensing units 21 is completed in one frame of display, the reading stage of all the light sensing units 21 is completed in another frame of display, and the integration stage of the light sensing units 21 is between the initialization stage and the reading stage of each light sensing unit 21.
The initialization stage and the light sensation identification stage of the same light sensation identification stage are respectively arranged in the display process of different frames, so that the integration time of the integration stage between the initialization stage and the reading stage can be prolonged, more light signals are obtained, and more effective light sensation electric signals can be generated.
Specifically, as shown in fig. 3, the initialization phase in which the initialization signal FR1 is received by the S13 is located between two display phases in which the display signal DT is received by the S13, and the photo sensing identification phase in which the photo sensing electric signal FR2 is received by the S13 may also be located between the two same display phases in which the display signal DT is received by the S13. It should be noted that, in order to ensure the integration time of the light sensing device 21, the initialization stage and the reading stage between the same two display stages may belong to different adjacent light sensing identification stages, and between the two display stages, the reading stage of the previous light sensing identification stage is performed first, and then the initialization stage of the next light sensing identification stage is performed.
More specifically, as shown in fig. 4, in two adjacent light sensing stages, the reading stage in which the data line S13 receives the photo-sensing signal FR2 in the previous light sensing stage and the initialization stage in which the data line S13 receives the initialization signal FR1 in the other light sensing stage are located between the same two display stages. In addition, between the two display stages, a reading stage is performed in which the data line S13 receives the photo-sensing signal FR2 in the previous photo-sensing stage, and an initialization stage is performed in which the data line S13 receives the initialization signal FR1 in the other photo-sensing stage.
The initialization stage and the light sensation identification stage of the same light sensation identification stage are respectively arranged in the display processes of different frames, so that the integration time of the integration stage between the initialization stage and the reading stage can be prolonged; meanwhile, the reading stage of the light sensation identification stage of the previous period and the initialization stage of the light sensation identification stage of the previous period are carried out between the two display stages, so that the light sensation identification stage and the reading stage are carried out in the process of displaying each frame, the period length of the light sensation identification stage can be shortened, and the sensitivity of the light sensation identification stage is improved.
In addition, fig. 3 and 4 show that the display and the light sensation recognition are alternately performed, and the frequencies of the display and the light sensation recognition may be adjusted according to actual needs when the inventive concept of the present application is based.
In an embodiment of the present application, please refer to fig. 5, fig. 5 is a schematic diagram of a light sensing unit according to an embodiment of the present application, and as shown in fig. 5, the light sensing unit includes a storage capacitor C1 in addition to the light sensing device 21 and the second transistor 22. The photosensitive device 21 is specifically a photodiode, and the drain of the second transistor 22 is electrically connected to the cathode of the photodiode and the first plate of the storage capacitor C1; the anode of the photodiode and the second plate of the storage capacitor are connected with a grounding signal.
In an embodiment of the present application, please refer to fig. 6, fig. 6 is a schematic diagram of a light sensing identification unit in another embodiment of the present application, and as shown in fig. 6, the light sensing identification unit further includes a storage capacitor C1, a third transistor T3, a fourth transistor T4, and a fifth transistor T5. Specifically, the drain of the second transistor 22 is electrically connected to the cathode of the photodiode, the source of the second transistor 22 is electrically connected to the drain of the third transistor T3, and the Gate of the second transistor 22 is electrically connected to the second scan line Gate 1'; the first plate of the storage capacitor C1 is electrically connected with the source electrode of the second transistor 22, and the second plate of the storage capacitor C1 and the anode of the photodiode are connected with a ground signal; a gate of the third transistor T3 is electrically connected to the reset-on signal line Rst, a drain of the third transistor T3 is electrically connected to a source of the second transistor 22, and a source of the third transistor T3 is electrically connected to the data line S13; a gate of the fourth transistor T4 is electrically connected to the source of the second transistor 22, a source of the fourth transistor T4 is electrically connected to the reference voltage line VDD, and a drain of the fourth transistor T4 is electrically connected to the source of the fifth transistor T5; a gate of the fifth transistor T5 is electrically connected to the selection signal line Sel, and a drain of the fifth transistor T5 is electrically connected to the data line S13.
Specifically, in the initialization phase, the reset-on signal line Rst transmits a reset-on signal to the gate of the third transistor T3 to control the third transistor T3 to be turned on, and the initialization signal transmitted by the data line S13 is transmitted to the photodiode through the third transistor T3 and the second transistor 22. In the reading stage, the select signal line Sel transmits a select signal to the gate of the fifth transistor T5 to control the fifth transistor T5 to turn on, and the photo sensing signal is read by the data line S13 through the second transistor 22, the fourth transistor T4 and the fifth transistor T5.
It should be noted that when the source of the second transistor 22 is connected to the data line S13, the data line S13 may not only transmit the initialization signal but also transmit the photo-sensing signal, and may also transmit one of the initialization signal and the photo-sensing signal or other signals, for example, the data line S13 is only used for transmitting the initialization signal.
Specifically, referring to fig. 1 and fig. 2, the plurality of display units in the display panel includes a first display unit, a second display unit and a third display unit which are sequentially and adjacently disposed. The first transistor 12 in the first display unit is electrically connected to the data line S13, the first transistor 12 in the second display unit is electrically connected to the data line S11, and the first transistor 12 in the third display unit is electrically connected to the data line S12. Referring to fig. 7, fig. 7 is a schematic diagram of a light sensing identification unit according to another embodiment of the present application, in which a source of a third transistor T3 and a source of a fourth transistor T4 share a data line S13 with a source of a first transistor corresponding to a first display unit; a reset start signal line RST connected to the gate of the third transistor T3 shares the data line S11 with the source of the first transistor corresponding to the second display cell; the gate of the fifth transistor T5 is connected to the selection signal line Sel, and the drain of the fifth transistor T5 shares the data line S12 with the source of the corresponding first transistor 12 in the third display unit.
At this time, referring to fig. 8, fig. 8 is a timing diagram illustrating an operation of the display panel according to another embodiment of the present application, in a display phase, the second scan line Gate 1' controls the second transistor 22 to be turned off, and the light emitting diode is isolated from an external electrical signal; meanwhile, the first scan line Gate1 controls the first transistor to be turned on, and the data line 13, the data line 11, and the data line 12 sequentially receive the display signal DT to control the display unit 11 to emit light. After the display stage, the light sensing identification stage is performed, the first scan line Gate1 controls the first transistor to be turned off, and the display unit 11 is isolated from the external electric signal; meanwhile, the second scan line Gate 1' controls the first transistor 12 to be turned on, and the light emitting diode can perform electrical signal interaction with the outside.
Because the signal lines in the light sensing identification unit are basically multiplexed with the data lines in the display area, the number of the signal lines in the display area can be obviously reduced, the interference among signals is reduced, and the effective display area is increased.
The specific processes of the light sensing identification stage, the reset stage, the integration stage and the reading stage can be the same as those of the above embodiments, i.e. the light sensing identification stage is inserted between the display stages. The embodiments of the present application are not described in detail, and only one way is analyzed to facilitate understanding.
Specifically, referring to fig. 8, the light sensing identification stage is also inserted between the adjacent display stages, specifically, the data line S13, the data line S12 and the data line S11 sequentially receive a display signal once to complete one display stage, and then the light sensing identification stage is performed. Specifically, the second scan line Gate 1' controls the second transistor to be turned on, the data line S12 transmits the initialization signal FR1, and at this time, the signal on the selection signal line Sel controls the data line S13 to transmit the photo sensing signal FR2 after the fifth transistor is turned on; at this time, after the reset turn-on signal RS on the data line S11 controls the third transistor T3 to turn on, the photodiode receives the initialization signal FR1 for initialization.
Therefore, when the circuits of the light sensation identification units are complex and one light sensation identification unit multiplexes more data lines, the initialization stage and the light sensation identification stage of the same light sensation identification stage can be respectively arranged in the display process of different frames, so that the integration time of the integration stage between the initialization stage and the reading stage is prolonged; meanwhile, the reading stage of the light sensation identification stage of the previous period and the initialization stage of the light sensation identification stage of the previous period are carried out between the two display stages, so that the light sensation identification stage and the reading stage are carried out in the process of displaying each frame, the period length of the light sensation identification stage can be shortened, and the sensitivity of the light sensation identification stage is improved.
It should be noted that the inventive concept of the present application is not limited to the specific circuit structure applied to the light-sensing identification unit recited in the embodiments of the present application.
In an embodiment of the present application, there is also provided a display device including the display panel provided in any one of the embodiments.
In the display device provided by the application embodiment, the light sensing identification unit and the display unit share the data line, namely, the light sensing identification unit is arranged in the display area, and the number of signal lines additionally arranged in the light sensing identification unit is reduced; in addition, the shift registers corresponding to the light sensing identification unit and the display unit share the frame scanning starting signal, so that the light sensing identification is realized in the process of displaying a frame of picture, and the precision of the light sensing identification and the synchronism of the display are improved.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (13)
1. A display panel is characterized by comprising a plurality of display units arranged in an array, a plurality of light sensation identification units arranged in an array, a first shift register unit and a second shift register unit;
the display units comprise first transistors and display pixels, the grid electrodes of the first transistors are electrically connected with first scanning lines, the source electrodes of the first transistors are electrically connected with data lines, and the drain electrodes of the first transistors are electrically connected with the display pixels;
the light sensation identification unit comprises a second transistor and a light sensation device, wherein the grid electrode of the second transistor is electrically connected with the second scanning line, the source electrode of the second transistor is electrically connected with the data line, and the drain electrode of the second transistor is electrically connected with the light sensation device;
the first shift register unit comprises a first shift register which is cascaded, and the first shift register is electrically connected with the first scanning line;
the second shift register unit comprises a cascaded second shift register, and the second shift register is electrically connected with the second scanning line;
the first-stage shift register of the first shift register unit and the first-stage shift register of the second shift register unit are connected with the same frame scanning starting signal line;
in a display stage, the first scanning line controls the first transistor to be turned on, the second scanning line controls the second transistor to be turned off, and the data line transmits a display signal;
in the light sensation identification stage, the first scanning line controls the first transistor to be closed, the second scanning line controls the second transistor to be opened, and the data line transmits a light sensation identification signal.
2. The display panel of claim 1, further comprising a plurality of multiplexing units, a display IC and a light sensing identification IC;
one end of the multi-path selection unit is electrically connected with the data line, and the other end of the multi-path selection unit is electrically connected with the display IC and the fingerprint identification IC at the same time;
in the display stage, the multi-path selection unit transmits a display signal of a display IC to the data line;
in the light sensing identification stage, the light sensing identification signal is transmitted between the light sensing identification IC and the data line through the multi-path selection unit.
3. The display panel according to claim 1, wherein the display panel comprises an integrated IC, and the data line is electrically connected to the integrated IC;
in a display stage, the integrated IC outputs a display signal to the data line;
in the light sensation identification stage, the light sensation identification signal is transmitted between the integrated IC and the data line.
4. The display panel of claim 1, wherein the light sensing device is a photodiode for converting an optical signal into a light-sensitive electrical signal;
the light sensation identification unit is used for fingerprint identification.
5. The display panel as claimed in claim 4, wherein the light sensing identification signal comprises an initialization signal and a light sensing signal, and the light sensing identification stage comprises:
an initialization stage, wherein the first scanning line controls the first transistor to be closed, the second scanning line controls the second transistor to be opened, and the data line transmits an initialization signal to the photodiode;
an integration stage, wherein the second scanning signal line controls the second transistor to be turned off, and the photodiode integrates the optical signal and converts the optical signal into an electric signal;
in the reading stage, the first scanning line controls the first transistor to be closed, the second scanning line controls the second transistor to be opened, and the data line transmits the light sensing signal generated by the photodiode.
6. The display panel of claim 5, wherein a portion of the light sensation identification stage is located between two adjacent display stages.
7. The display panel of claim 5, wherein the initialization stage, the integration stage and the readout stage of the same light sensation identification stage are located between two adjacent display stages, the readout stage is located between another two adjacent display stages, and the integration stage is located between the initialization stage and the readout stage.
8. The display panel of claim 7, wherein the read stage of the previous light sensing stage and the initialization stage of the other light sensing stage in the two adjacent light sensing stages are located between the same two display stages.
9. The display panel according to claim 6 or 7, wherein the light sensing unit further comprises a storage capacitor;
the drain electrode of the second transistor is electrically connected with the cathode of the photodiode and the first polar plate of the storage capacitor;
and the anode of the photodiode and the second plate of the storage capacitor are connected with a grounding signal.
10. The display panel according to claim 6 or 7, wherein the light sensing identification unit further comprises a storage capacitor, a third transistor, a fourth transistor and a fifth transistor;
the drain electrode of the second transistor is electrically connected with the cathode electrode of the photodiode;
the first polar plate of the storage capacitor is electrically connected with the source electrode of the second transistor, and the second polar plate of the storage capacitor and the anode of the photodiode are connected with a ground signal;
a gate electrode of the third transistor is electrically connected with a reset starting signal line, a drain electrode of the third transistor is electrically connected with a source electrode of the second transistor, and a source electrode of the third transistor is electrically connected with the data line;
a gate of the fourth transistor is electrically connected with a source of the second transistor, and a drain of the fourth transistor is electrically connected with a source of the fifth transistor;
the gate of the fifth transistor is electrically connected to the selection signal line, and the drain of the fifth transistor is electrically connected to the data line.
11. The display panel according to claim 11,
in an initialization stage, the reset starting signal line transmits a reset starting signal to the grid electrode of the third transistor to control the third transistor to be opened; the initialization signal is transmitted to the photodiode through the third transistor and the second transistor;
in a reading stage, the selection signal line transmits a selection signal to the grid electrode of the fifth transistor to control the fifth transistor to be opened; the photo sensing signal is read by the data line through the fourth transistor and the fifth transistor.
12. The display panel according to claim 10, wherein the plurality of display units include a first display unit, a second display unit, and a third display unit which are adjacently disposed in this order;
the source electrode of the third transistor and the source electrode of the fourth transistor share a data line with the source electrode of the first transistor corresponding to the first display unit;
a reset starting signal line connected with the grid electrode of the third transistor shares a data line with the source electrode of the first transistor corresponding to the second display unit;
the drain electrode of the fifth transistor shares a data line with the source electrode of the corresponding first transistor in the third display unit.
13. A display device characterized in that it comprises a display panel according to any one of claims 1 to 13.
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