WO2022116294A1

WO2022116294A1 - Display apparatus and denoising method therefor

Info

Publication number: WO2022116294A1
Application number: PCT/CN2020/137636
Authority: WO
Inventors: 温雷; 金羽锋
Original assignee: 深圳市华星光电半导体显示技术有限公司
Priority date: 2020-12-03
Filing date: 2020-12-18
Publication date: 2022-06-09
Also published as: CN112599064B; CN112599064A

Abstract

Disclosed are a display apparatus and a denoising method therefor. The display apparatus comprises a display panel, a denoising module and a mainboard. A light sensing circuit on the display panel comprises a blank column (FA), a data column (DA) and a reading module (40). The reading module reads a sensing signal from the data column (DA) and a blank signal from the blank column (FA). The denoising module subtracts the blank signal from the sensing signal to obtain a denoised signal, and transmits the denoised signal to the mainboard, so as to eliminate noise that appears on the display panel that is integrated with a light sensor.

Description

Display device and denoising method thereof

technical field

The present application relates to the field of display technology, and in particular, to a display device and a denoising method thereof.

Background technique

With the development of display technology, people not only have higher requirements for the image quality of display products, but also have more demands for the expansion of application scenarios of display products. For example, integrating a light sensor into a display panel can improve the degree of human-computer interaction, thereby increasing the overall added value of the display panel. While the light sensor is integrated in the display panel, the light sensor and the display panel use the same set of power supply and power IC (Integrated Circuit, chip). However, due to the different working principles, the noise specifications of the light sensor and the display panel are not exactly the same for the power IC. For example, in conventional display, the noise of the power IC used is relatively large, such as 5% of the operating voltage, while the general light sensor requires the noise of the power IC to be controlled at 1% or lower. An existing display panel integrated with a light sensor directly adopts this type of IC, which will cause the signal sensed by the light sensor to have noise on the entire surface, which will seriously affect the sensing result.

Therefore, the problem of noise in the existing display panel integrated with the light sensor needs to be solved.

technical problem

The present application provides a display device and a denoising method thereof, so as to alleviate the technical problem of noise occurring in an existing display panel integrated with a light sensor.

technical solutions

In order to solve the above-mentioned problems, the technical solutions provided by this application are as follows:

An embodiment of the present application provides a display device, which includes a display panel and a denoising module, the denoising module is connected to the display panel, and the display panel is divided into a display area and a non-display area. The display panel includes a substrate, a display circuit and a light sensing circuit. Both the display circuit and the light sensing circuit are arranged on the substrate. Wherein, the light sensing circuit includes a data column and a blank column. The data column is located in the display area, and the data column includes at least one sensing unit. The blank column is located in at least one of the non-display areas on both sides of the display area, and the blank column includes at least one blank unit. Wherein, the sensing unit is used to provide a sensing signal, the blank unit is used to provide a blank signal, and the denoising module is used to collect the sensing signal and the blank signal, and convert the sensing signal The blank signal is subtracted to obtain a denoised signal.

In the display device provided in the embodiment of the present application, the light sensing circuit further includes a reading module, the reading module is disposed in the non-display area, and the reading module is connected to the denoising module, And the reading module is also connected with the sensing unit and the blank unit for reading the sensing signal and the blank signal, and converting the sensing signal and the blank signal into digital signal for acquisition by the denoising module.

In the display device provided in the embodiment of the present application, 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 application, the reading module is a COF bound on one side of the light sensing circuit.

In the display device provided by the embodiment of the present application, the sensing unit includes a first transistor, a first storage capacitor, and a second transistor, and the first storage capacitor is connected between a gate and a drain of the first transistor. the second transistor is connected between the first transistor and the reading module; the blank cell includes a third transistor, and the third transistor is connected with the reading module.

In the display device provided by the embodiment of the present application, the light sensing circuit further includes a first power supply line, a second power supply line and a scan line, wherein the blank column and the data column are both connected to the first power supply The lines are parallel, the scan lines are parallel to the second power lines, and the scan lines are perpendicular to the first power lines.

In the display device provided by the embodiment of the present application, 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, and the first transistor is connected to the second power line. The drain of a 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, and the drain of the first transistor is also connected to the first storage capacitor. The source of the second transistor is connected, the gate of the second transistor is connected to the scan line, and the drain of the second transistor is connected to the reading module.

In the display device provided by the embodiment of the present application, the blank unit 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 connected to the first storage capacitor. Three transistors are not connected.

In the display device provided in the embodiment of the present application, the display panel is a liquid crystal display panel or an OLED display panel.

In the display device provided in the embodiment of the present application, the display circuit and the light sensing circuit are arranged in different layers.

In the display device provided by the embodiment of the present application, the display panel further includes a plurality of pixels, and there is an interval between every two adjacent pixels, and the light sensing circuit is disposed relatively above the interval. .

In the display device provided in the embodiment of the present application, the display circuit and the light sensing circuit are arranged in the same layer.

In the display device provided by the embodiment of the present application, the display device further includes a timing control board, and the denoising module is integrated on the timing control board.

In the display device provided by the embodiment of the present application, the denoising module includes a field programmable gate array.

An embodiment of the present application further provides a denoising method for the display device according to one of the foregoing embodiments, the display device further includes a main board, and the denoising method includes the following steps: the reading module reads the The sensing signal of the data column and the blank signal of the blank column, and convert the sensing signal and the blank signal into a digital signal; the denoising module collects the The sensing signal and the blank signal are outputted to the mainboard; the mainboard receives the denoised signal and converts it into a corresponding touch signal or fingerprint identification signal.

In the denoising method for a display device provided by the embodiment of the present application, the reading module reads the sensing signal of the data column and the blank signal of the blank column through a reading line.

In the denoising method for a display device provided by the embodiment of the present application, the reading module is a COF bound on one side of the light sensing circuit.

In the denoising method for a display device provided by the embodiment of the present application, the denoising module collects the sensing signal and the blank signal converted into the digital signal, and outputs the denoising signal to the mainboard. The steps include: the de-noising module collects the sensing signal and the blank signal converted into the digital signal; the de-noising module subtracts the blank signal from the sensing signal to obtain the de-noising module. noise signal; the de-noising module transmits the de-noising signal to the main board through a communication protocol.

In the denoising method for a display device provided by the embodiment of the present application, the display device further includes a timing control board, and the denoising module is integrated on the timing control board.

In the denoising method for a display device provided by the embodiment of the present application, the denoising module includes a field programmable gate array.

beneficial effect

The display device and its denoising method provided by the present application set the light sensing circuits on the display panel into blank columns and data columns, and read the signals of the blank columns and data columns through a reading module. The de-noising module subtracts the signal of the blank column from the signal of the data column to obtain the de-noising signal, and transmits the de-noising signal to the main board. In this way, the noise of the display panel integrated with the light-sensing sensor is eliminated, and the accuracy of the sensing result of the light-sensing sensor is improved.

Description of drawings

In order to more clearly illustrate the embodiments or technical solutions in the prior art, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for invention. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic diagram of a frame structure of a display device according to an embodiment of the present application.

FIG. 2 is a schematic top-view structure diagram of a display panel provided by an embodiment of the present application.

FIG. 3 is a schematic diagram of a first cross-sectional structure of a display panel provided by an embodiment of the present application.

FIG. 4 is a schematic diagram of a first circuit connection of the light sensing circuit provided by the embodiment of the present application.

FIG. 5 is a schematic diagram of a second circuit connection of the light sensing circuit provided by the embodiment of the present application.

FIG. 6 is a schematic diagram of a second cross-sectional structure of a display panel provided by an embodiment of the present application.

FIG. 7 is a schematic flowchart of a method for denoising a display device according to an embodiment of the present application.

Embodiments of the present invention

The following descriptions of the various embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present application may be practiced. Directional terms mentioned in this application, such as [upper], [lower], [front], [rear], [left], [right], [inner], [outer], [side], etc., are only for reference Additional schema orientation. Therefore, the directional terms used are used to describe and understand the present application, rather than to limit the present application. In the figures, structurally similar elements are denoted by the same reference numerals. In the drawings, the thicknesses 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 shown, but the present application is not limited thereto.

Please refer to FIG. 1 and FIG. 2 , FIG. 1 is a schematic diagram of a frame structure of a display device provided by an embodiment of the present application, and FIG. 2 is a schematic top-view structure diagram of a display panel provided by an embodiment of the present application. 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 light sensing circuit 10 is integrated on the display panel 100 . The denoising module 200 is used to eliminate the noise generated by the light sensing circuit 10 . noise. The display panel 100 may be a liquid crystal display panel, an OLED display panel, or other display panels. Since the display panel 100 of the present application is integrated with the light-sensing sensing circuit 10, it can be applied to light-sensing application scenarios such as touch control, fingerprint recognition, and long-distance optical interaction.

Specifically, please refer to FIG. 3 , which is a first cross-sectional schematic diagram of a display panel provided by an embodiment of the present application. The display panel 100 includes a substrate 20 , a display circuit 30 and the light sensing circuit 10 . The display circuit 30 is arranged on the substrate 20, the light sensing circuit 10 is also arranged on the substrate 20, and the display circuit 30 and the light sensing circuit 10 are arranged in different layers, so the The light sensing circuit 10 is located above the display circuit 30 . The display circuit 30 is used for driving the pixels (not shown) of the display panel 100 to display. The light sensing circuit 10 is used to realize functions such as touch control and fingerprint recognition by sensing changes in light intensity.

It can be understood that the display panel 100 further includes other functional layers disposed between the display circuit 30 and the light sensing circuit 10. Taking an OLED display panel as an example, the other functional layers may be light-emitting layers, encapsulation layer, etc. The light sensing circuit 10 is disposed on these functional layers. In order to prevent the light sensing circuit 10 from affecting the light transmittance of the display panel 100, the light sensing circuit 10 needs to avoid the display panel. 100 pixels. For example, the light sensing circuit 10 may be disposed relatively above the interval of the pixels of the display panel 100 .

Please continue to refer to FIG. 2 , the light sensing circuit 10 includes a blank column FA, a data column DA and a reading module 40 . The data column DA is located in the display area AA, and a plurality of photosensors 50 are arranged in the data column DA. The photosensors 50 may be phototransistors, which can convert the received optical signals into electrical signals. , to achieve touch, fingerprint recognition and other functions. The data columns DA may be multiple columns, and the specific number of columns may be determined according to the number of light sensing sensors 50 to be provided on the display panel 100 . The blank column FA is located in any of the non-display areas NA on both sides of the display area AA, the number of columns of the blank column FA is at least one row, and the photosensor 50 is not disposed in the blank column FA. It can be understood that, when the number of columns of the blank columns FA is two, the blank columns FA of the two columns may be respectively arranged in the two non-display areas NA. Setting the blank column FA in the non-display area NA can avoid affecting the light sensitivity of the light sensor 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 is only for convenience in describing the embodiments of the present application, but the present application is not limited thereto.

Specifically, please refer to FIG. 1 and FIG. 4 . FIG. 4 is a schematic diagram of the first circuit connection of the light sensing circuit provided by the embodiment of the present application. The data array DA includes at least one sensing unit 60 for providing sensing signals. The blank column FA includes at least one blank cell 70 for providing blank signals. The reading module 40 is connected to the denoising module 200, and the reading module 40 is also connected to the sensing unit 60 and the blank unit 70 for reading the sensing signal and the blanking unit 70. 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 COF (chip on film, chip on film) bound on one side of the light sensing circuit 10 . The de-noising module 200 is configured to collect the sensing signal and the blank signal converted into a digital signal, and subtract the blank signal from the sensing signal to obtain a de-noised 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 light sensor 50 . The first transistor T1 is used for sensing the change of light intensity. The second transistor T2 is a switch 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 reading module 40 . The blank unit 70 includes a third transistor T3 , which is also a switching transistor, and is connected to the reading module 40 . The first transistor T1 , the second transistor T2 , and the third transistor T3 can all be thin film transistors (Thin Film Transistor, TFT). It can be understood that, the sensing unit 60 is provided with the light sensing sensor 50 , while the blank unit 70 is not provided with the light sensing sensor 50 .

Specifically, continuing to refer to FIG. 4 , the light sensing circuit further includes a first power supply line VDD, a second power supply line VGG and a scan line Scan, wherein the blank column FA and the data column DA are both connected to the A power line VDD is parallel, 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. Both the first power line VDD and the second power line VGG provide a constant DC voltage.

Specifically, the gate of the first transistor T1 is connected to the second power supply line VGG, the source of the first transistor T1 is connected to the first power supply line VDD, and the first transistor T1 The drain 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, and the drain of the first transistor T1 is also connected to The source of the second transistor T2 is connected, 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 reading module 40 .

The reading module 40 is connected to the drain of the second transistor T2 through a reading line READ to read the sensing signal of the sensing unit 60 . Specifically, the read line READ is connected to the second transistors T2 of the plurality of sensing units 60 (only one sensing unit 60 is shown in the figure as an example). Specifically, the second power supply line VGG provides a voltage to the gate of the first transistor T1, so that the source and the drain of the first transistor T1 are turned on. When the channel is irradiated by light, a photo-generated leakage current is generated, and different degrees of leakage current are generated according to the degree of light intensity. The electrical signal of the first power supply 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 drained by light in the channel of the first transistor T1. changes due to current. The other end of the first storage capacitor C1 is connected to the second power line VGG. At this time, the first storage capacitor C1 is in a charged state, and the charged voltage includes the information of light sensitivity. At the same time, one end of the first storage capacitor C1 connected to the drain of the first transistor T1 is also connected to the source of the second transistor T2. When the scan line Scan provides the gate of the second transistor T2 When the voltage turns on the source and 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 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 an electrical signal into a digital signal for the denoising module 200 to collect.

Further, the reading module 40 reads the blank signal of the blank cell 70 through another reading line READ. Specifically, the gate of the third transistor T3 in the blank unit 70 is connected to the scan line Scan, the drain of the third transistor T3 is connected to the read line READ, and the third transistor T3 is connected to the read line READ. The source of T3 is off. 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, an electrical signal is generated by coupling between the read line READ and other nearby lines, such as the signal of the line on the display circuit 30 or the noise on the first power line VDD or the scan line Scan. The electrical signal 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 an electrical signal into a digital signal for the denoising module 200 to collect.

Further, the de-noising module 200 is configured to collect the sensing signal and the blank signal converted into a digital signal, and subtract the blank signal from the sensing signal to obtain a de-noising signal, and denoise the signal. The de-noising signal is transmitted to the main board 300 . The mainboard 300 is used to convert the de-noising signal into a corresponding touch signal or fingerprint identification signal and perform subsequent processing, such as merging the position indicated by the touch signal with the video signal of the display panel 100 in the display. displayed on the panel 100 . Wherein, the denoising module 200 includes a Field-Programmable Gate Array (Field-Programmable Gate Array). Gate Array, FPGA), also known as universal IC. The denoising module 200 may be set independently, or may be integrated on the timing control (Timing Control, Tcon) board 400 of the display device 1000 . The motherboard 300 is also an SOC motherboard (System on Chip, system on chip) of the display device 1000 . The SOC mainboard can be connected to the timing control board 400 through an I2C interface or an SPI interface.

Specifically, referring to FIG. 1 and FIG. 4, the working principle of the light sensing circuit 10 is as follows: the first power line VDD and the second power line VGG are constant voltage voltage sources, and the sensing unit 60 of the data column DA The first transistor T1 is always on, and charges the first capacitor C1. Switch Transistor The second transistor T2 is an addressing switch, and the scan line Scan controls the second transistor T2 to be turned on row by row to detect the first capacitor C1. When light is irradiated on the first transistor T1, the leakage current of the first transistor T1 increases, so that the capacitance of the first capacitor C1 changes. The second transistor T2 detects the change of the first capacitance 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 illumination, and The blank cells 70 of the blank column FA are not affected by light irradiation because the photosensors are not provided, and the blank signal read by the read line READ from the third transistor T3 remains unchanged. 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 de-noising module 200 is configured to collect the sensing signal and the blank signal converted into a digital signal, and subtract the blank signal from the sensing signal to obtain a de-noised signal.

Since the first transistors T1 on other data columns DA are not irradiated by light, the leakage current of the first transistor T1 in the corresponding sensing unit 60 remains unchanged, and the read line READ reads from the corresponding second transistor T2 The magnitude of the received sensing signal is different from the magnitude of the sensing signal read from the second transistor T2 of the data column DA illuminated by light, so as to determine the photosensitive position of the display device.

In the display device 1000 of the present embodiment, the light-sensing circuit 10 integrated on the display panel 100 is set as the blank column FA and the data column DA, and the reading module 40 reads the blank column FA and the data column DA. Signal. The de-noising module 200 is used for subtracting the blank signal of the blank row FA from the sensing signal of the data row DA to obtain a de-noised signal, and transmits the de-noised signal to the main board 300 . In this way, the noise occurring in the display panel 100 integrated with the light-sensing sensor is eliminated, and the accuracy of the sensing result of the light-sensing sensor is improved.

In an embodiment, different from the above-mentioned embodiment, the blank cell 70 ′ further includes a fourth transistor T4 and a second storage capacitor C2 . For details, please refer to FIG. 5 , which is a light sensor provided by the present application. A schematic diagram of the second circuit connection of the sensing circuit. The gate of the fourth transistor T4 is connected to the second power line VGG, the source of the fourth transistor T4 is connected to the first power line VDD, and the drain of the fourth transistor T4 is connected to the One end of the second storage capacitor C2 is connected to the second power supply line VGG, the other end of the second storage capacitor C2 is connected to the second power supply line VGG, the gate of the third transistor T3 is connected to the scan line Scan, and the third The drain of the transistor T3 is connected to the reading module 40 .

Specifically, the reading 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 third transistor T3 is connected to the read line READ. The source of the 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 a light sensor, that is, the fourth transistor T4, but different from the data column, the fourth transistor T4 (light sensor) of the blank column is not connected to the switch transistor. (ie, the third transistor T3 ), so regardless of whether the blank cells 70 ′ in the blank column receive light, the blank signals read by the reading module from the blank cells 70 ′ are all background noises. For other descriptions, please refer to the above-mentioned embodiments, which will not be repeated here.

In one embodiment, please refer to FIG. 6 , which is a second schematic cross-sectional view of the display panel provided by the embodiment of the present application. Different from the above-mentioned embodiment, the display circuit 30 of the display panel 101 and the light sensing circuit 10 are arranged 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. In this way, the signal lines (eg, the first power line VDD, the second power line VGG, and the scan line Scan) of the light sensing circuit 10 can be multiplexed with corresponding signal lines in the display circuit 30 . For other descriptions, please refer to the above-mentioned embodiments, which will not be repeated here.

An embodiment of the present application further provides a denoising method for the display device according to one of the foregoing embodiments. Please refer to FIG. 1 and FIG. 7 in conjunction. FIG. 7 is a schematic flowchart of a denoising method for a display device provided by an embodiment of the present application. The denoising method includes the following steps:

Step S10: the reading module reads the sensing signal of the data column and the blank signal of the blank column, and converts the sensing signal and the blank signal into a digital signal;

Specifically, please refer to FIG. 4 , the reading module 40 is connected to the drain of the second transistor T2 through a reading line READ to read the sensing signal of the sensing unit 60 . Specifically, the second power line VGG provides 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 The light-induced leakage current is generated due to the light irradiation, and different degrees of leakage current are generated according to the degree of light intensity. The electrical signal of the first power supply 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 drained by light in the channel of the first transistor T1. changes due to current. The other end of the first storage capacitor C1 is connected to the second power line VGG. At this time, the first storage capacitor C1 is in a charged state, and the charged voltage includes the information of light sensitivity. At the same time, one end of the first storage capacitor C1 connected to the drain of the first transistor T1 is also connected to the source of the second transistor T2. When the scan line Scan provides the gate of the second transistor T2 When the voltage turns on the source and 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 C1 is discharged through the second transistor T2 and flows to the read module 40 through the read line READ.

Further, the reading module 40 reads the blank signal of the blank cell 70 through another reading 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 third transistor The source of T3 is off. 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.

Step S20: the de-noising module collects the sensing signal and the blank signal converted into the digital signal, and outputs the de-noising signal to the motherboard;

Specifically, referring to FIG. 1 , the denoising module 200 collects the sensing signal and the blank signal converted into the digital signal; the denoising module 200 subtracts the blank from the sensing signal The signal obtains the de-noising signal; the de-noising module 200 transmits the de-noising signal to the main board 300 through a communication protocol.

Further, the denoising module 200 includes a field programmable gate array, that is, a universal IC. The denoising module 200 can be set independently or integrated on the timing control board 400 of the display device 1000 .

Step S30: The mainboard receives the de-noising signal and converts it into a corresponding touch signal or fingerprint identification signal.

Specifically, referring to FIG. 1 , the mainboard 300 converts the de-noising signal into a corresponding touch signal or fingerprint identification signal and performs subsequent processing, for example, compares the position indicated by the touch signal with the display panel 100 The video signal is fused and displayed on the display panel 100 .

According to the above embodiment, it can be known that:

The present application provides a display device and a denoising method thereof. The display device includes a display panel, a denoising module and a mainboard. The display panel includes a photosensitive array and a reading module, and is divided into a display area and a non-display area. The photosensitive array includes blank columns and data columns, the blank columns are located in at least one of the non-display areas on both sides of the display area, and the data columns are located in the display area. The reading module is arranged in the non-display area. The reading module is used for reading the sensing signal of the data column and the blank signal of the blank column. The de-noising module is used for subtracting the blank signal of the blank row from the sensing signal of the data row to obtain a de-noising signal, and transmitting the de-noising signal to the main board. To eliminate the noise of the display panel integrated with the light sensor.

To sum up, although the present application has disclosed the above-mentioned preferred embodiments, the above-mentioned preferred embodiments are not intended to limit the present application. Those of ordinary skill in the art, without departing from the spirit and scope of this application, can Therefore, the scope of protection of the present application is subject to the scope defined by the claims.

Claims

A display device, comprising a display panel and a denoising module, the denoising module is connected to the display panel, the display panel is divided into a display area and a non-display area, the display panel includes:

substrate;

a display circuit, disposed on the substrate; and

A light-sensing sensing circuit, disposed on the substrate, wherein the light-sensing sensing circuit includes:

a data column located within the display area, the data column including at least one sensing unit; and

a blank column, the blank column is located in at least one of the non-display areas on both sides of the display area, and the blank column includes at least one blank cell;

Wherein, the sensing unit is used to provide a sensing signal, the blank unit is used to provide a blank signal, and the denoising module is used to collect the sensing signal and the blank signal, and convert the sensing signal The blank signal is subtracted to obtain a denoised signal.
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 area, and the reading module is connected to the denoising module , and the reading module is also connected with the sensing unit and the blank unit for reading the sensing signal and the blank signal, and converting the sensing signal and the blank signal into digital signals for acquisition by the denoising module.
The display device of claim 2, wherein the reading module is connected with the sensing unit and the blank unit through a reading line.
The display device according to claim 2, wherein the reading module is a COF bound on one side of the light sensing circuit.
The display device according to claim 2, wherein the sensing unit comprises a first transistor, a first storage capacitor and a second transistor, and the first storage capacitor is connected to a gate and a drain of the first transistor The second transistor is connected between the first transistor and the reading module; the blank unit includes a third transistor, and the third transistor is connected with the reading module.
The display device according to claim 5, wherein the light sensing circuit further comprises a first power supply line, a second power supply line and a scan line, wherein the blank column and the data column are both connected with the first power supply line and the data column. The power lines are parallel, the scan lines are parallel to the second power lines, and the scan lines are perpendicular to the first power lines.
6. The display device of claim 6, wherein the gate of the first transistor is connected to the second power supply line, the source of the first transistor is connected to the first power supply line, the 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, and the drain of the first transistor is also connected to The source of the second transistor is connected to the scan line, the gate of the second transistor is connected to the scan line, and the drain of the second transistor is connected to the reading module.
The display device according to claim 5, wherein the blank cell further comprises a fourth transistor and a second storage capacitor, the fourth transistor is connected to the second storage capacitor, and the second storage capacitor is connected to the second storage capacitor. The third transistor is not connected.
The display device according to claim 1, wherein the display panel is a liquid crystal display panel or an OLED display panel.
The display device according to claim 1, wherein the display circuit and the light sensing circuit are arranged in different layers.
The display device according to claim 10, wherein the display panel further comprises a plurality of pixels, and there is an interval between every two adjacent pixels, and the light sensing circuit is disposed opposite to the interval. above.
The display device according to claim 1, wherein the display circuit and the light sensing circuit are arranged in the same layer.
The display device according to claim 1, wherein the display device further comprises a timing control board, and the denoising module is integrated on the timing control board.
The display device of claim 13, wherein the denoising module comprises a field programmable gate array.
A denoising method for a display device as claimed in claim 1, wherein the display device further comprises a main board, and the denoising method comprises the following steps:

The reading module reads the sensing signal of the data column and the blank signal of the blank column, and converts the sensing signal and the blank signal into a digital signal;

The denoising module collects the sensing signal and the blank signal converted into the digital signal, and outputs the denoising signal to the mainboard; and

The mainboard receives the denoising signal and converts it into a corresponding touch signal or fingerprint identification signal.
16. The denoising method of a display device according to claim 15, wherein the reading module reads the sensing signal of the data column and the blank signal of the blank column through a reading line.
The denoising method of a display device according to claim 16, wherein the reading module is a COF bound on one side of the light sensing circuit.
The denoising method for a display device according to claim 15, wherein the denoising module collects the sensing signal and the blank signal converted into the digital signal, and outputs the denoising signal to the motherboard steps, including:

The denoising module collects the sensing signal and the blank signal converted into the digital signal;

The de-noising module obtains the de-noising signal by subtracting the blank signal from the sensing signal; and

The denoising module transmits the denoising signal to the mainboard through a communication protocol.
The method for denoising a display device according to claim 18, wherein the display device further comprises a timing control board, and the denoising module is integrated on the timing control board.
The denoising method of a display device according to claim 19, wherein the denoising module comprises a field programmable gate array.