CN112599064B - Display device and denoising method thereof - Google Patents
Display device and denoising method thereof Download PDFInfo
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- CN112599064B CN112599064B CN202011411460.5A CN202011411460A CN112599064B CN 112599064 B CN112599064 B CN 112599064B CN 202011411460 A CN202011411460 A CN 202011411460A CN 112599064 B CN112599064 B CN 112599064B
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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
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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]
- G09G3/3208—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] organic, e.g. using organic light-emitting diodes [OLED]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
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- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides a display device and a denoising method thereof. The display device comprises a display panel, a denoising module and a main board. The display panel is integrated with a light sensing circuit and is divided into a display area and a non-display area. The light sensing circuit comprises a blank column, a data column and a reading module, wherein the blank column is positioned in at least one non-display area on two sides of the display area, and the data column is positioned in the display area. The reading module is arranged in the non-display area. The reading module is used for reading the sensing signals of the data columns and the blank signals of the blank columns. The denoising module is used for subtracting the blank signal of the blank column from the sensing signal of the data column to obtain a denoising signal, and transmitting the denoising signal to the mainboard to eliminate noise generated by the display panel integrated with the optical sensor.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display device and a denoising method thereof.
Background
With the development of display technology, people have higher requirements on the image quality of display products and have more requirements on the expansion of application scenes of the display products. For example, the light sensor is integrated in the display panel, so that the degree of man-machine interaction can be improved, and the overall added value of the display panel is improved. While the light sensor is Integrated on the display panel, the light sensor and the display panel use the same set of power supply and power IC (Integrated Circuit). However, due to different operation principles, the light sensor and the display panel do not have the same noise specification requirements for the power IC. For example, in the conventional display, the noise of the power IC is relatively large, for example, 5% of the operating voltage, and the noise of the power IC is required to be controlled to 1% or less in the general light sensor. The existing display panel integrated with the optical sensor directly adopts the IC, which causes the whole noise of the signal sensed by the optical sensor to seriously affect the sensing result.
Therefore, the problem of noise occurring in the conventional display panel integrated with the photo sensor needs to be solved.
Disclosure of Invention
The invention provides a display device and a denoising method thereof, which are used for relieving the technical problem that the noise occurs in the conventional display panel integrated with a light sensor.
In order to solve the above problems, the technical scheme provided by the invention is as follows:
the embodiment of the invention provides a display device which comprises a display panel and a denoising module, wherein the denoising module is connected with the display panel, and the display panel is divided into a display area and a non-display area. The display panel comprises a substrate, a display circuit and a light sensation sensing circuit. The display circuit and the light sensing circuit are both arranged on the substrate. The light sensing circuit comprises a data column and a blank column. The data column is located in the display area and comprises at least one sensing unit. The blank column is positioned in at least one non-display area on two sides of the display area, and the blank column comprises at least one blank unit. The sensor unit is used for providing a sensing signal, the blank unit is used for providing a blank signal, and the denoising module is used for collecting the sensing signal and the blank signal and subtracting the blank signal from the sensing signal to obtain a denoised signal.
In the display device provided in the embodiment of the present invention, the light sensing circuit further includes a reading module, the reading module is disposed in the non-display area, the reading module is connected to the denoising module, and the reading module is further connected to the sensing unit and the blank unit, and is configured to read the sensing signal and the blank signal, and convert the sensing signal and the blank signal into a digital signal for the denoising module to collect.
In the display device provided in the embodiment of the present invention, the reading module is connected to the sensing unit and the blank unit through a reading line.
In the display device provided in the embodiment of the present invention, the sensing unit includes a first transistor, a first storage capacitor, and a second transistor, the first storage capacitor is connected between a gate and a drain of the first transistor, and the second transistor is connected between the first transistor and the reading module; the blank cell includes a third transistor coupled to the read block.
In the display device provided by the embodiment of the invention, the light sensing circuit further includes a first power line, a second power line, and a scan line, wherein the blank column and the data column are parallel to the first power line, the scan line is parallel to the second power line, and the scan line is perpendicular to the first power line.
In the display device according to the embodiment of the present invention, the gate of the first transistor is connected to the second power line, the source of the first transistor is connected to the first power line, the drain of the first transistor is connected to one end of the first storage capacitor, the other end of the first storage capacitor is connected to the second power line, the drain of the first transistor is further connected to the source of the second transistor, the gate of the second transistor is connected to the scan line, and the drain of the second transistor is connected to the read module.
In the display device provided in the embodiment of the present invention, the blank cell further includes a fourth transistor and a second storage capacitor, the fourth transistor is connected to the second storage capacitor, and the second storage capacitor is not connected to the third transistor.
An embodiment of the present invention further provides a denoising method for a display device in one of the foregoing embodiments, where the display device further includes a main board, and the denoising method includes the following steps: the reading module reads the sensing signals of the data columns and the blank signals of the blank columns and converts the sensing signals and the blank signals into digital signals; the denoising module collects the sensing signal and the blank signal after the sensing signal and the blank signal are converted into the digital signal, and outputs a denoising signal to the mainboard; and the mainboard receives the denoising signal and converts the denoising signal into a corresponding touch signal or fingerprint identification signal.
In the denoising method of the display device according to the embodiment of the present invention, the step of acquiring the sensing signal and the blank signal converted into the digital signal by the denoising module, and outputting the denoising signal to the main board includes: the denoising module acquires the sensing signal and the blank signal which are converted into the digital signal; the denoising module subtracts the blank signal from the sensing signal to obtain the denoising signal; and the denoising module transmits the denoising signal to the mainboard through a communication protocol.
In the denoising method of the display device provided by the embodiment of the present invention, the denoising module includes a field programmable gate array.
The beneficial effects of the invention are as follows: the display device and the denoising method thereof set the light sensing circuit on the display panel into the blank column and the data column, and read the signals of the blank column and the data column through the reading module. And the denoising module subtracts the signal of the blank column from the signal of the data column to obtain a denoising signal and transmits the denoising signal to the mainboard. Therefore, noise generated by the display panel integrated with the light sensor is eliminated, and accuracy of sensing results of the light sensor is improved.
Drawings
In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a frame structure of a display device according to an embodiment of the present invention;
fig. 2 is a schematic top view of a display panel according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a display panel according to an embodiment of the invention;
FIG. 4 is a first circuit connection diagram of a light sensing circuit according to an embodiment of the present invention;
FIG. 5 is a second circuit connection diagram of a light sensing circuit according to an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of a display panel according to a second embodiment of the present invention;
fig. 7 is a schematic flow chart of a denoising method of a display device according to an embodiment of the present invention.
Detailed Description
The following description of the various embodiments refers to the accompanying drawings that illustrate specific embodiments in which the invention may be practiced. The directional terms mentioned in the present invention, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], are only referring to the directions of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and understanding and is in no way limiting. In the drawings, elements having similar structures are denoted by the same reference numerals. In the drawings, the thickness of some layers and regions are exaggerated for clarity of understanding and ease of description. That is, the size and thickness of each component shown in the drawings are arbitrarily illustrated, but the present invention is not limited thereto.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic diagram of a frame structure of a display device according to an embodiment of the present invention, and fig. 2 is a schematic diagram of a top view structure of a display panel according to an embodiment of the present invention. The display device 1000 includes a display panel 100, a denoising module 200, and a main board 300. The denoising module 200 is connected to the display panel 100. The main board 300 is connected to the denoising module 200. The display panel 100 is divided into a display area AA and a non-display area NA, the display panel 100 is integrated with a light sensing circuit 10, and the denoising module 200 is used for eliminating noise generated by the light sensing circuit 10. The display panel 100 may be a liquid crystal display panel, an OLED display panel, or other display panels. The display panel 100 of the present invention can be applied to light-sensitive application scenarios such as touch control, fingerprint recognition, and remote optical interaction, because the light-sensitive sensing circuit 10 is integrated.
Specifically, referring to fig. 3, fig. 3 is a first cross-sectional view of a display panel according to an embodiment of the invention. The display panel 100 includes a substrate 20, a display circuit 30, and the light sensing circuit 10. The display circuit 30 is disposed on the substrate 20, the light sensing circuit 10 is also disposed on the substrate 20, the display circuit 30 and the light sensing circuit 10 are disposed in different layers, and the light sensing circuit 10 is disposed above the display circuit 30. The display circuit 30 is used for driving pixels (not shown) of the display panel 100 to display. The light sensing circuit 10 is used for realizing functions of touch control, fingerprint identification and the like by sensing the change of light intensity.
It is understood that the display panel 100 further includes other functional layers disposed between the display circuit 30 and the light sensing circuit 10, for example, an OLED display panel, and the other functional layers may be a light emitting layer, an encapsulation layer, and the like. The light sensing circuit 10 is disposed on the functional layers, and in order to avoid the light sensing circuit 10 affecting the light transmittance of the display panel 100, the light sensing circuit 10 needs to avoid pixels of the display panel 100. For example, the light sensing circuit 10 may be disposed relatively above the interval of the pixels of the display panel 100.
Referring to fig. 2, the photo sensor circuit 10 includes a blank column FA, a data column DA, and a reading module 40. The data array DA is located in the display area AA, a plurality of light-sensitive sensors 50 are arranged in the data array DA, and the light-sensitive sensors 50 can be phototransistors and can convert received light signals into electric signals so as to realize functions of touch control, fingerprint identification and the like. The data columns DA may be a plurality of columns, and the specific number of the columns may be determined according to the number of the light sensors 50 required to be disposed on the display panel 100. The blank columns FA are located in any one of the non-display areas NA on two sides of the display area AA, the number of the columns of the blank columns FA is at least one, and no light-sensitive sensor 50 is arranged in each blank column FA. It is to be understood that, when the number of the columns of the blank columns FA is two, two columns of the blank columns FA may be respectively disposed in the two non-display areas NA. The blank columns FA are provided in the non-display area NA to avoid affecting the sensitivity of the photosensor 50 in the display area AA. It should be noted that the number of blank columns and the number of data columns shown in fig. 2 are only for convenience of describing the embodiment of the present invention, but the present invention is not limited thereto.
Specifically, referring to fig. 1 and 4, fig. 4 is a first circuit connection diagram of the light sensing circuit according to the embodiment of the invention. The data column DA comprises at least one sensing unit 60, the sensing unit 60 being configured to provide a sensing signal. The blank column FA includes at least one blank cell 70, and the blank cell 70 is used to provide a blank signal. The reading module 40 is connected to the denoising module 200, and the reading module 40 is further connected to the sensing unit 60 and the blank unit 70, and is configured to read the sensing signal and the blank signal, and convert the sensing signal and the blank signal into digital signals for the denoising module 200 to collect. The reading module 40 may be a Chip On Film (COF) bonded to one side of the photo sensor circuit 10. The denoising module 200 is configured to collect the sensing signal and the blank signal after being converted into digital signals, and subtract the blank signal from the sensing signal to obtain a denoising signal.
Specifically, the sensing unit 60 includes a first transistor T1, a first storage capacitor C1 and a second transistor T2, wherein the first transistor T1 is the photo sensor 50. The first transistor T1 is used to sense a change in light intensity. The second transistor T2 is a switching transistor. The first storage capacitor C1 is connected between the gate and the drain of the first transistor T1, and the second transistor T2 is connected between the first transistor and the read module 40. The blank cell 70 includes a third transistor T3, the third transistor T3 is also a switching transistor, and the third transistor T3 is connected to the read module 40. The first Transistor T1, the second Transistor T2, and the third Transistor T3 may be Thin Film Transistors (TFTs). It is understood that the sensing unit 60 is provided with the light-sensitive sensor 50, and the blank unit 70 is not provided with the light-sensitive sensor 50.
Specifically, with continued reference to fig. 4, the photo sensing circuit further includes a first power line VDD, a second power line VGG, and a Scan line Scan, wherein the blank column FA and the data column DA are both parallel to the first power line VDD, the Scan line Scan is parallel to the second power line VGG, and the Scan line Scan is perpendicular to the first power line VDD. The first power line VDD and the second power line VGG each provide a constant direct current voltage.
Specifically, the gate of the first transistor T1 is connected to the second power line VGG, the source of the first transistor T1 is connected to the first power line VDD, the drain of the first transistor T1 is connected to one end of the first storage capacitor C1, the other end of the first storage capacitor C1 is connected to the second power line VGG, the drain of the first transistor T1 is further connected to the source of the second transistor T2, the gate of the second transistor T2 is connected to the Scan line Scan, and the drain of the second transistor T2 is connected to the read module 40.
The READ module 40 is connected to the drain of the second transistor T2 through a READ line READ to READ the sensing signal of the sensing unit 60. Specifically, a READ line READ is connected to the second transistors T2 of the sensing units 60 (only one sensing unit 60 is shown as an example). Specifically, the second power line VGG supplies a voltage to the gate of the first transistor T1 to turn on the source and the drain of the first transistor T1, and the channel of the first transistor T1 generates a photo leakage current due to light irradiation and generates leakage currents of different degrees depending on the degree of light intensity. The electric signal of the first power line VDD flows from the source to the drain of the first transistor T1 and reaches one end of the first storage capacitor C1, and is varied by a photo leakage current of the channel of the first transistor T1. The other end of the first storage capacitor C1 is connected to the second power line VGG, and the first storage capacitor C1 is in a charging state at this time, and the charged voltage includes information about light sensation. Meanwhile, one end of the first storage capacitor C1 connected to the drain of the first transistor T1 is further connected to the source of the second transistor T2, and when the Scan line Scan supplies a voltage to the gate of the second transistor T2 to turn on the source and the drain of the second transistor T2, the voltage stored in the first storage capacitor C1 flows to the drain through the source of the second transistor T2, so that the first storage capacitor C1 is discharged through the second transistor T2 and flows to the READ module 40 through the READ line READ. The electrical signal obtained by the reading module 40 is the sensing signal, and the reading module 40 is configured to convert the sensing signal from the electrical signal to a digital signal for the denoising module 200 to collect.
Further, the READ module 40 READs the blank signal of the blank cell 70 through another READ line READ. Specifically, the gate of the third transistor T3 in the blank cell 70 is connected to the Scan line Scan, the drain of the third transistor T3 is connected to the READ line READ, and the source of the third transistor T3 is in an off state. When the Scan line Scan supplies a voltage to the gate of the third transistor T3 to turn on the source and drain of the third transistor T3, no signal is given to the READ line READ. At this time, the READ line READ is coupled with a signal of another nearby circuit, for example, a circuit on the display circuit 30, noise on the first power line VDD, or the Scan line Scan to generate an electrical signal, which is also a noise signal, and the electrical signal flows to the READ module 40 through the READ line READ. The electrical signal obtained by the reading module 40 is the blank signal, and the reading module 40 is configured to convert the blank signal from the electrical signal to a digital signal for the denoising module 200 to collect.
Further, the denoising module 200 is configured to collect the sensing signal and the blank signal after being converted into the digital signal, subtract the blank signal from the sensing signal to obtain a denoising signal, and transmit the denoising signal to the motherboard 300. The main board 300 is configured to convert the denoising signal into a corresponding touch signal or fingerprint identification signal and perform subsequent processing, for example, fuse a position indicated by the touch signal and a video signal of the display panel 100 on the display panel 100 for display. The denoising module 200 includes a Field-Programmable Gate Array (FPGA), i.e., a universal IC. The denoising module 200 may be separately disposed, or may be integrated on a Timing Control (Tcon) board 400 of the display device 1000. The main board 300 is also an SOC main board (System on Chip) of the display device 1000. The SOC motherboard may be connected to the timing control board 400 through an I2C interface or an SPI interface.
Specifically, with continued reference to fig. 1 and 4, the light-sensing circuit 10 operates according to the following principle: the first power line VDD and the second power line VGG are constant voltage sources, the first transistor T1 in the sensor unit 60 of the data column DA is always in an on state, and charges the first capacitor C1. The second transistor T2 is an addressing switch, and the Scan line Scan controls the second transistors T2 to be turned on row by row to detect the first capacitor C1. When light is irradiated to the first transistor T1, a leakage current of the first transistor T1 increases, and the capacitance of the first capacitor C1 changes. The second transistor T2 detects the change of the first capacitor C1, at this time, the sensing signal READ by the READ line READ from the second transistor T2 is the sensing signal generated by the first transistor T1 due to light, and the blank cell 70 of the blank row FA is not affected by light because the light sensor is not disposed, and the blank signal READ by the READ line READ from the third transistor T3 is not changed. The reading module 40 reads the sensing signal and the blank signal, and converts the sensing signal and the blank signal into digital signals for the denoising module 200 to collect. The denoising module 200 is configured to collect the sensing signal and the blank signal after being converted into digital signals, and subtract the blank signal from the sensing signal to obtain a denoising signal.
Since the first transistor T1 in the other data column DA is not irradiated with light, the leakage current of the first transistor T1 in the corresponding sensor cell 60 is not changed, and the magnitude of the sensing signal READ by the READ line READ from the corresponding second transistor T2 is different from the magnitude of the sensing signal READ from the second transistor T2 in the data column DA irradiated with light, thereby determining the light sensing position of the display device.
In the display device 1000 of the present embodiment, the light-sensing circuits 10 integrated on the display panel 100 are arranged into the blank columns FA and the data columns DA, and signals of the blank columns FA and the data columns DA are read by the reading module 40. The denoising module 200 is configured to subtract the blank signal of the blank column FA from the sensing signal of the data column DA to obtain a denoising signal, and transmit the denoising signal to the main board 300. Thus, noise generated in the display panel 100 integrated with the photo sensor is eliminated, and accuracy of a sensing result of the photo sensor is improved.
In an embodiment, different from the above embodiments, the blank cell 70' further includes a fourth transistor T4 and a second storage capacitor C2, specifically referring to fig. 5, and fig. 5 is a second circuit connection diagram of the light sensing circuit provided by the present invention. A gate of the fourth transistor T4 is connected to the second power line VGG, a source of the fourth transistor T4 is connected to the first power line VDD, a drain of the fourth transistor T4 is connected to one end of the second storage capacitor C2, the other end of the second storage capacitor C2 is connected to the second power line VGG, a gate of the third transistor T3 is connected to the Scan line Scan, and a drain of the third transistor T3 is connected to the read block 40.
Specifically, the READ module 40 READs the blank signal of the blank cell 70' through the READ line READ. Specifically, the gate of the third transistor T3 in the blank cell 70' is connected to the Scan line Scan, the drain of the third transistor T3 is connected to the READ line READ, and the source of the third transistor T3 is not connected to the second storage capacitor C2. When the Scan line Scan supplies a voltage to the gate of the third transistor T3 to turn on the source and drain of the third transistor T3, no signal is given to the READ line READ. At this time, the READ line READ is coupled with signals of other nearby lines to generate an electrical signal, and the electrical signal flows to the READ module 40 through the READ line READ.
It can be understood that the blank column in this embodiment is also provided with the photo sensor, i.e. the fourth transistor T4, but unlike the data column, the fourth transistor T4 (photo sensor) of the blank column does not access the switching transistor (i.e. the third transistor T3), so the blank signal read from the blank cell 70 'by the reading module is background noise regardless of whether the blank cell 70' of the blank column receives light or not. For other descriptions, please refer to the above embodiments, which are not repeated herein.
In an embodiment, please refer to fig. 6, and fig. 6 is a second cross-sectional view of a display panel according to an embodiment of the present invention. Unlike the above embodiments, the display circuit 30 and the light sensing circuit 10 of the display panel 101 are disposed in the same layer. Specifically, the display panel 101 includes a substrate 20, a display circuit 30, and the light sensing circuit 10. The display circuit 30 is disposed on the substrate 20, the light sensing circuit 10 is also disposed on the substrate 20, and the display circuit 30 and the light sensing circuit 10 are disposed on the same layer. Thus, the signal lines (such as the first power line VDD, the second power line VGG, and the Scan line Scan) of the photo sensor circuit 10 can be multiplexed with the corresponding signal lines of the display circuit 30. For other descriptions, please refer to the above embodiments, which are not repeated herein.
The embodiment of the invention also provides a denoising method for the display device in one of the embodiments. Referring to fig. 1 and fig. 7 in combination, fig. 7 is a schematic flowchart of a denoising method of a display device according to an embodiment of the present invention, where the denoising method includes the following steps:
step S10: the reading module reads the sensing signals of the data columns and the blank signals of the blank columns and converts the sensing signals and the blank signals into digital signals;
specifically, referring to fig. 4, the reading module 40 is connected to the drain of the second transistor T2 through a READ line READ to READ the sensing signal of the sensing unit 60. Specifically, the second power line VGG supplies a voltage to the gate of the first transistor T1 to turn on the source and the drain of the first transistor T1, and the channel of the first transistor T1 generates a photo leakage current due to light irradiation and generates leakage currents of different degrees depending on the degree of light intensity. The electric signal of the first power line VDD flows from the source to the drain of the first transistor T1 and reaches one end of the first storage capacitor C1, and is varied by a photo leakage current of the channel of the first transistor T1. The other end of the first storage capacitor C1 is connected to the second power line VGG, and the first storage capacitor C1 is in a charging state at this time, and the charged voltage includes information of light sensation. Meanwhile, one end of the first storage capacitor C1 connected to the drain of the first transistor T1 is further connected to the source of the second transistor T2, and when the Scan line Scan provides a voltage to the gate of the second transistor T2 to turn on the source and the drain of the second transistor T2, the voltage stored in the first storage capacitor C1 flows to the drain through the source of the second transistor T2, so that the first storage capacitor C1 discharges through the second transistor T2 and flows to the READ module 40 through the READ line READ.
Further, the READ module 40 READs the blank signal of the blank cell 70 through another READ line READ. Specifically, the gate of the third transistor T3 in the blank cell 70 is connected to the Scan line Scan, the drain of the third transistor T3 is connected to the READ line READ, and the source of the third transistor T3 is in a disconnected state. When the Scan line Scan supplies a voltage to the gate of the third transistor T3 to turn on the source and drain of the third transistor T3, no signal is supplied to the READ line READ. At this time, the READ line READ is coupled with signals of other nearby circuits to generate an electrical signal, and the electrical signal flows to the READ module 40 through the READ line READ.
Step S20: the denoising module collects the sensing signal and the blank signal after the sensing signal and the blank signal are converted into the digital signal, and outputs a denoising signal to the mainboard;
specifically, referring to fig. 1, the denoising module 200 collects the sensing signal and the blank signal after converting into the digital signal; the denoising module 200 subtracts the blank signal from the sensing signal to obtain the denoising signal; the denoising module 200 transmits the denoising signal to the main board 300 through a communication protocol.
Further, the denoising module 200 includes a field programmable gate array, i.e., a universal IC. The denoising module 200 may be separately provided, or may be integrated on the timing control board 400 of the display device 1000.
Step S30: and the mainboard receives the denoising signal and converts the denoising signal into a corresponding touch signal or fingerprint identification signal.
Specifically, with reference to fig. 1, the main board 300 converts the denoising signal into a corresponding touch signal or fingerprint identification signal and performs subsequent processing, for example, fusing a position indicated by the touch signal and a video signal of the display panel 100 to display on the display panel 100.
According to the above embodiment:
the invention provides a display device and a denoising method thereof. The display panel comprises a light sensing array and a reading module and is divided into a display area and a non-display area. The light sensing array comprises a blank column and a data column, the blank column is positioned in at least one non-display area on two sides of the display area, and the data column is positioned in the display area. The reading module is arranged in the non-display area. The reading module is used for reading the sensing signals of the data columns and the blank signals of the blank columns. The denoising module is used for subtracting the blank signal of the blank column from the sensing signal of the data column to obtain a denoising signal and transmitting the denoising signal to the mainboard. To eliminate noise occurring in the display panel integrated with the photo sensor.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.
Claims (9)
1. A display device, comprising a display panel and a de-noising module, wherein the de-noising module is connected to the display panel, the display panel is divided into a display area and a non-display area, and the display panel comprises:
a substrate;
a display circuit disposed on the substrate; and
a light sensing circuit disposed on the substrate, wherein the light sensing circuit includes:
a data column located within the display area, the data column including at least one sensing unit; and
blank columns, wherein the blank columns are positioned in at least one non-display area on two sides of the display area and comprise at least one blank unit;
the denoising module is used for acquiring the sensing signal and the blank signal and subtracting the blank signal from the sensing signal to obtain a denoising signal;
the blank unit comprises a switch transistor but does not comprise a light sensor and a storage capacitor, a source electrode of the switch transistor is in an off state, the blank signal is transmitted through a reading line, and the reading line is connected with a drain electrode of the switch transistor of which the source electrode is in the off state.
2. The display device according to claim 1, wherein the light sensing circuit further comprises a reading module, the reading module is disposed in the non-display region, the reading module is connected to the de-noising module, and the reading module is further connected to the sensing unit and the blank unit, and is configured to read the sensing signal and the blank signal, and convert the sensing signal and the blank signal into digital signals for the de-noising module to collect.
3. The display device according to claim 2, wherein the reading module is connected to the sensing unit and the blank unit through a reading line.
4. The display device according to claim 2, wherein the sensing unit includes a first transistor, a first storage capacitor, and a second transistor, the first storage capacitor being connected between a gate and a drain of the first transistor, the second transistor being connected between the first transistor and the reading module; the blank unit comprises a third transistor which is connected with the reading module; wherein the switching transistor corresponds to the third transistor.
5. The display device as claimed in claim 4, wherein the photo sensing circuit further comprises a first power line, a second power line, and a scan line, wherein the blank column and the data column are parallel to the first power line, the scan line is parallel to the second power line, and the scan line is perpendicular to the first power line.
6. A display device according to claim 5, wherein the gate of the first transistor is connected to the second power supply line, a source of the first transistor is connected to the first power supply line, the drain of the first transistor is connected to one end of the first storage capacitor, the other end of the first storage capacitor is connected to the second power supply line, and the drain of the first transistor is further connected to a source of the second transistor, a gate of the second transistor is connected to the scan line, and a drain of the second transistor is connected to the reading module.
7. A denoising method for a display device according to any one of claims 2 to 6, wherein the display device further comprises a main board, the denoising method comprising the steps of:
the reading module reads the sensing signals of the data columns and the blank signals of the blank columns and converts the sensing signals and the blank signals into digital signals;
the denoising module collects the sensing signal and the blank signal after the sensing signal and the blank signal are converted into the digital signal, and outputs a denoising signal to the mainboard; and
and the mainboard receives the denoising signal and converts the denoising signal into a corresponding touch signal or fingerprint identification signal.
8. The method for denoising of the display device according to claim 7, wherein the denoising module collects the sensor signal and the blank signal converted into the digital signal, and outputs a denoised signal to the main board, comprising:
the denoising module acquires the sensing signal and the blank signal which are converted into the digital signal;
the denoising module subtracts the blank signal from the sensing signal to obtain the denoising signal; and
and the denoising module transmits the denoising signal to the mainboard through a communication protocol.
9. The method of claim 7, wherein the denoising module comprises a field programmable gate array.
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| CN202011411460.5A CN112599064B (en) | 2020-12-03 | 2020-12-03 | Display device and denoising method thereof |
| PCT/CN2020/137636 WO2022116294A1 (en) | 2020-12-03 | 2020-12-18 | Display apparatus and denoising method therefor |
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| CN114187836B (en) | 2021-12-12 | 2023-06-02 | 武汉华星光电技术有限公司 | Display panel |
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