Driving method of light sensing device, light sensing circuit and display device

Abstract

The invention discloses a driving method of a light sensing device, a light sensing circuit and a display device. The method comprises the following steps: a first control step: under the condition that a driving module performs display driving on a display panel, controlling the driving module to send a first driving signal to a light sensing device at a first moment, the duration of the positive voltage driving signal is less than or equal to 20% of the duration corresponding to each first driving frame; in the second control step, the driving module is controlled to send out a touch signal at a second moment, the second moment is located after the end moment of the duration of the first driving signal, and the duration corresponding to each first driving frame at least comprises at most one time of the first driving signal and one time of the touch signal; and a sampling step: controlling the driving module to carry out sampling detection on the light-sensitive device in the continuous time period of the first driving signal. The problem that the photosensitive device is prone to directional drift under the condition of continuous power-on, and consequently the photosensitive device loses efficacy is solved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a driving method of a photosensitive device, a photosensitive circuit and a display device. Background Art

[0002] In existing ambient light sensing devices, the light sensor is driven by DC and is always in the driving state. In this case, the light sensor will generate a higher temperature after a period of use, which will cause the device to drift in a certain direction, causing the threshold voltage of the device to increase in a certain direction, resulting in a smaller output current, which exceeds the detection range of the driving circuit and causes the light sensor to fail. Summary of the invention

[0003] The present application provides a driving method of a photosensitive device, a light sensing circuit and a display device to solve the problem in the prior art that the photosensitive device is prone to directional drift when continuously powered, resulting in failure of the photosensitive device.

[0004] According to one aspect of the present application, a driving method for a photosensitive device is provided, wherein the photosensitive device is located in a non-display area of ​​a display panel, and the photosensitive device is electrically connected to a driving module, and the driving method comprises: a first control step: when the driving module drives the display panel for display, controlling the driving module to send a first driving signal to the photosensitive device at a first moment, wherein the first driving signal comprises a positive voltage driving signal, and the duration of the positive voltage driving signal is less than or equal to 20% of the duration corresponding to each first driving frame, and the duration corresponding to the first driving frame has a preset relationship with the driving frequency of the driving module; a second control step: controlling the driving module to send a touch signal at a second moment, wherein the second moment is located after the end moment of the duration of the first driving signal, and the duration corresponding to each first driving frame contains at least one first driving signal and one touch signal; a sampling step: controlling the driving module to perform sampling detection on the photosensitive device within the duration of the first driving signal.

[0005] According to another aspect of the present application, a light sensing circuit and a driving method of the light sensing device described in the light sensing circuit are also provided, wherein the light sensing circuit comprises: a light sensing circuit, comprising a light sensing device and a reference device, wherein the gate of the light sensing device is electrically connected to the gate of the reference device, the source of the light sensing device is electrically connected to the source of the reference device, and the reference device is at least used to compare the degree of offset of the light sensing device; and a sampling circuit, comprising a processor, wherein the light sensing device and the reference device are electrically connected to the processor respectively.

[0006] According to another aspect of the present application, a display device is also provided, comprising the light sensing circuit as described above.

[0007] The present application proposes a driving method for a photosensitive device, which controls a driving module to send a positive pressure driving signal to the photosensitive device at a first moment, enters a photosensitive stage, and enables the photosensitive device to work. When the positive pressure driving signal is continuous, the driving module is controlled to sample the photosensitive stage to read the current output by the photosensitive driving circuit, and then controls the driving module to send a touch signal at a second moment, wherein the positive pressure driving signal and the touch signal are located in the same driving frame, and the duration of the positive pressure driving signal is at most 20% of the corresponding duration of the driving frame, thereby reducing the driving time of the photosensitive device and reducing the risk of directional drift of the photosensitive device. The problem that the photosensitive device is prone to directional drift when continuously powered on, resulting in failure of the photosensitive device, is solved in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0009] Figure 1 is a schematic flow chart of a method for driving a photosensitive device according to an embodiment of the present application;

[0010] Figure 2 is a schematic structural diagram of a photosensitive device in a method for driving a photosensitive device provided according to an embodiment of the present application;

[0011] Figure 3 is a timing diagram of a method for driving a photosensitive device according to an embodiment of the present application;

[0012] Figure 4 is another timing diagram of a driving method of a photosensitive device provided in an embodiment of the present application;

[0013] Figure 5 is another timing diagram of the driving method of the photosensitive device provided in the embodiment of the present application;

[0014] Figure 6 is another timing diagram of the driving method of the photosensitive device provided in the embodiment of the present application;

[0015] Figure 7 is another timing diagram of the driving method of the photosensitive device provided in the embodiment of the present application;

[0016] Figure 8 is another timing diagram of the driving method of the photosensitive device provided in the embodiment of the present application;

[0017] Fig. 9is another timing diagram of the driving method of the photosensitive device provided in the embodiment of the present application;

[0018] Fig.10 is another timing diagram of the driving method of the photosensitive device provided in the embodiment of the present application;

[0019] Fig.11 is another timing diagram of the driving method of the photosensitive device provided in the embodiment of the present application;

[0020] Fig.12 is another timing diagram of the driving method of the photosensitive device provided in the embodiment of the present application;

[0021] Fig.13 is another timing diagram of the driving method of the photosensitive device provided in the embodiment of the present application;

[0022] Fig.14 is another timing diagram of the driving method of the photosensitive device provided in the embodiment of the present application;

[0023] Fig.15 is another timing diagram of the driving method of the photosensitive device provided in the embodiment of the present application;

[0024] Fig.16 is another timing diagram of the driving method of the photosensitive device provided in the embodiment of the present application;

[0025] Fig.17 is another timing diagram of the driving method of the photosensitive device provided in the embodiment of the present application;

[0026] Fig.18 is another timing diagram of the driving method of the photosensitive device provided in the embodiment of the present application;

[0027] Fig.19 is a partial schematic diagram of a light sensing driving circuit provided according to an embodiment of the present application;

[0028] Fig. 20 It is a schematic diagram of a display device provided in an embodiment of the present application.

[0029] The above drawings include the following reference numerals:

[0030] 1. Display device; 2. Display area; 10. Photosensitive device; 20. Reference device; 30. Flexible circuit board; 31. Voltage divider resistor; 40. Driver chip; 50. Photosensitive circuit; 60. Sampling circuit; 61. Processor; 62. Digital-to-analog converter; 63. Filter. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] As mentioned in the background technology, the photosensitive sensor is driven by DC and is always in the driving state. In this case, the photosensitive sensor will generate a higher temperature after a period of use, which will cause the device to drift in a certain direction, resulting in a small output current of the device, exceeding the detection range of the driving circuit, and causing the photosensitive sensor to fail.

[0035] According to one embodiment of the present application, Figure 1 As shown, a driving method of a photosensitive device is provided, wherein the photosensitive device is located in a non-display area of ​​a display panel, and the photosensitive device is electrically connected to a driving module. The driving method includes:

[0036] First control step S101: when the driving module drives the display panel, the driving module is controlled to send a first driving signal to the photosensitive device at a first moment, wherein the first driving signal includes a positive voltage driving signal, and the duration of the positive voltage driving signal is less than or equal to 20% of the duration corresponding to each first driving frame, and the duration corresponding to the first driving frame has a preset relationship with the driving frequency of the driving module;

[0037] Second control step S102: controlling the driving module to send a touch signal at a second moment, wherein the second moment is after the end moment of the duration of the first driving signal, and the duration corresponding to each first driving frame includes at most one first driving signal and one touch signal;

[0038] Sampling step S103: controlling the driving module to perform sampling detection on the photosensitive device within the duration of the first driving signal.

[0039] By adopting the above-mentioned driving method of the photosensitive device, the above-mentioned positive voltage driving signal and the touch signal are located in the same driving frame, and the duration of the positive voltage driving signal is at most 20% of the corresponding duration of the above-mentioned driving frame, thereby reducing the driving time of the photosensitive device, reducing the offset of the threshold voltage of the photosensitive device, and thus reducing the risk of directional drift of the photosensitive device, thereby increasing the service life of the photosensitive device. The problem in the prior art that the photosensitive device is prone to directional drift when continuously powered on, resulting in failure of the photosensitive device, is solved.

[0040] The above is the core idea of ​​this application. The technical solutions in the embodiments of this application will be described clearly and completely below in conjunction with the drawings in the embodiments of this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] In the above optional implementation manner, the above first drive signal occupies at most 20% of the above drive frame duration. When the drive frequency of the above drive module is 120 Hz, the corresponding duration of each drive frame is 8.3 ms, and the first drive signal is at most 1.66 ms; when the drive frequency of the above drive module is 90 Hz, the corresponding duration of each drive frame is 11.11 ms, and the first drive signal is at most 2.22 ms; when the drive frequency of the above drive module is 60 Hz, the corresponding duration of each drive frame is 16.67 ms, and the first drive signal is at most 3.33 ms.

[0042] In some optional embodiments, such as Figure 2 As shown, controlling the driving module to send a first driving signal to the photosensitive device 10 at a first moment includes: controlling the driving module to perform a DC drive on the gate Vg of the photosensitive device 10; controlling the driving module to send a positive voltage driving signal to the source Vd of the photosensitive device 10 at the first moment, and the duration of the positive voltage driving signal is less than or equal to 20% of the duration corresponding to each of the first driving frames.

[0043] In the above optional implementation, if Figure 2As shown, a reference device 20 (including source Vd' and gate Vg') is usually set in the circuit to be connected in parallel with the photosensitive device 10. During the test, the output of the reference device 20 can be compared with the photosensitive device 10 to observe the voltage offset of the photosensitive device 10. The reference device 20 can also reduce the impact of voltage fluctuations on the circuit. The current of the photosensitive device 10 enters the flexible circuit board 30 through the source Vd-gate Vg, and the current is converted into a voltage according to the voltage divider resistor in the flexible circuit board 30. The driver chip 40 recognizes the above voltage and adjusts the backlight in the display panel according to the above voltage. Figure 3 As shown, the driving module sends a display driving signal STV to enter the display stage, and inputs a common voltage signal to the Vcom signal terminal, controls the driving module to connect the gate Vg to a continuous DC drive, so that the photosensitive device is turned on to enter the photosensitive stage, and at the same time controls the driving module to apply a first driving signal to the source Vd of the photosensitive device, so that the photosensitive device starts to operate. Figure 3 The first driving signal in is a positive voltage driving signal, wherein the driving time of the positive voltage driving signal is less than or equal to 20% of the duration corresponding to each of the above-mentioned first driving frames. By reducing the driving time of the photosensitive device 10, the offset degree of the threshold voltage of the photosensitive device is reduced. The driving chip is controlled to sample during the continuous process of the positive voltage driving signal. After the light sensing stage, the control driving module sends a touch signal to the Vcom signal terminal to enter the touch stage (touch stage), and a first driving frame ends. The corresponding duration of each first driving frame is related to the driving frequency. When the driving frequency is 120Hz, the corresponding duration of each driving frame is 8.3ms. When the above-mentioned photosensitive device 10 generates a directional offset of the threshold voltage, the above-mentioned current will become smaller, thereby causing the voltage converted by the above-mentioned voltage divider resistor to decrease. When the voltage decreases to a certain extent, it will exceed the minimum detection range of the driving chip 40, and the driving chip 40 will not be able to recognize it. The above-mentioned embodiment of the present application can improve the degree of directional offset of the threshold voltage of the photosensitive device 10, thereby reducing the failure risk of the photosensitive device 10.

[0044] In some optional embodiments, such as Figure 4 As shown, the above-mentioned first driving signal also includes a negative voltage driving signal, and the above-mentioned driving method also includes: a third control step: when the above-mentioned driving module performs display driving STV on the above-mentioned display panel, the above-mentioned driving module is controlled to send the above-mentioned negative voltage driving signal to the above-mentioned source Vd at a third moment, and the above-mentioned first driving frame corresponding to the above-mentioned third moment is located after the above-mentioned first driving frame corresponding to the above-mentioned first moment.

[0045] In the above optional implementation, if Figure 4As shown, after the first first driving frame applying the positive voltage driving signal, the second first driving frame is entered, the above-mentioned driving module sends a display driving signal STV to enter the display stage, and inputs a common voltage signal to the Vcom signal terminal, the gate Vg is connected to the continuous DC driving, the above-mentioned photosensitive device is turned on and is in the photosensitive stage, and the control driving module applies a negative voltage driving signal to the source Vd of the photosensitive device, wherein the driving time of the negative voltage driving signal is less than or equal to 20% of the duration corresponding to each of the above-mentioned first driving frames, and the driving time of the negative voltage driving signal can be consistent with the driving time of the positive voltage driving signal in the first first driving frame, and the directional deviation of the photosensitive device is suppressed by passing a reverse voltage to the photosensitive device to reduce the deviation degree of the threshold voltage of the photosensitive device. The control driving chip is sampled during the continuation of the negative voltage driving signal. At the fourth moment, the control driving module sends a touch signal to the Vcom signal terminal to enter the touch stage (touch stage), and the second first driving frame ends. According to the voltage offset degree of the photosensitive device, those skilled in the art can reasonably adjust the driving time of the positive voltage driving signal and the negative voltage driving signal. The driving time of the positive voltage driving signal and the negative voltage driving signal can also be inconsistent.

[0046] In some optional embodiments, such as Figure 5 As shown, controlling the driving module to send the first driving signal to the photosensitive device at the first moment includes: controlling the driving module to perform DC driving on the source Vd of the photosensitive device; controlling the driving module to send the positive voltage driving signal to the gate Vg of the photosensitive device at the first moment, and the duration of the positive voltage driving signal is less than or equal to 20% of the duration corresponding to each of the first driving frames.

[0047] In the above optional implementation, if Figure 5 As shown, the driving module sends a display driving signal STV to enter the display stage, and inputs a common voltage signal to the Vcom signal terminal, controls the driving module to connect the source electrode Vd to a continuous DC drive, so that the photosensitive device is turned on to enter the photosensitive stage, and at the same time controls the driving module to apply a first driving signal to the gate electrode Vg of the photosensitive device, so that the photosensitive device starts to operate. Figure 5 The first driving signal in the embodiment is a positive voltage driving signal, wherein the driving time of the positive voltage driving signal is less than or equal to 20% of the duration corresponding to each of the above first driving frames, so as to reduce the offset of the threshold voltage of the photosensitive device. Then the driving module is controlled to send a touch signal to the Vcom signal terminal to enter the touch stage (touch stage), and the driving chip is controlled to perform sampling during the continuous positive voltage driving signal, and a first driving frame ends.

[0048] In some optional embodiments, such as Figures 6 to 8As shown, the above-mentioned first driving signal also includes a negative voltage driving signal, and the above-mentioned driving method also includes: a third control step: when the above-mentioned driving module performs display driving on the above-mentioned display panel, the above-mentioned driving module is controlled to send the above-mentioned negative voltage driving signal to the above-mentioned gate Vg at a third moment, and the above-mentioned first driving frame corresponding to the above-mentioned third moment is located after the above-mentioned first driving frame corresponding to the above-mentioned first moment.

[0049] In the above optional implementation, if Figure 6 As shown, after applying the first first driving frame of positive voltage drive, the second first driving frame is entered, the above-mentioned driving module sends a display driving signal STV to enter the display stage, and inputs a common voltage signal to the Vcom signal terminal, and controls the driving module to apply continuous positive voltage DC drive to the source electrode Vd of the photosensitive device. At this time, the photosensitive device is turned on and enters the light sensing stage. At the same time, the driving module is controlled to apply a negative voltage driving signal to the gate electrode Vg of the photosensitive device, wherein the driving time of the negative voltage driving signal is less than or equal to 20% of the duration corresponding to each of the above-mentioned first driving frames, and the driving time of the negative voltage driving signal can be consistent with the driving time of the positive voltage driving signal in the first first driving frame. Figure 7 As shown, Figure 7 In Figure 6 In the second first driving frame, the negative voltage DC drive applied to the source Vd may not be sampled when negative voltage is applied to the source Vd and the gate Vg. If it is found that the threshold voltage deviation of the current photosensitive device is relatively large when the positive voltage driving signal is applied, such as Figure 8 As shown, after the first first driving frame in which the source electrode Vd is driven by a positive voltage, the second first driving frame is entered. The above-mentioned driving module sends a display driving signal STV to enter the display stage, and inputs a common voltage signal to the Vcom signal terminal, controls the driving module to apply a continuous negative voltage driving signal to the gate electrode Vg of the photosensitive device, and the photosensitive device is turned on to enter the photosensitive stage. At the same time, the driving module is controlled to apply a negative voltage driving signal to the source electrode Vd of the photosensitive device. The directional deviation of the photosensitive device is suppressed by passing a reverse voltage through the photosensitive device, and the photosensitive device is corrected to reduce the deviation degree of the threshold voltage of the photosensitive device. The driving chip is controlled to sample during the negative voltage driving signal. At the fourth moment, the driving module is controlled to send a touch signal to the Vcom signal terminal to enter the touch stage (touch stage), and the second first driving frame ends. According to the voltage deviation degree of the photosensitive device, those skilled in the art can reasonably adjust the driving time of the positive voltage driving signal and the negative voltage driving signal, and the driving time of the positive voltage driving signal and the negative voltage driving signal can also be inconsistent.

[0050] In some optional embodiments, such as Fig. 9As shown, controlling the driving module to send the first driving signal to the photosensitive device at the first moment includes: controlling the driving module to simultaneously send the positive voltage driving signal to the gate Vg of the photosensitive device and the source Vd of the photosensitive device, and the duration of the positive voltage driving signal is less than or equal to 20% of the duration corresponding to each of the first driving frames.

[0051] In the above optional implementation, if Fig. 9 As shown, the above-mentioned driving module sends a display driving signal STV to enter the display stage, and inputs a common voltage signal to the Vcom signal terminal, and controls the driving module to apply a first driving signal to the source Vg and the gate Vg at the same time, so that the photosensitive device enters the photosensitive stage and starts to operate. In this case, the photosensitive device is turned on when the first driving signal is applied, and is turned off after the first driving signal is not applied, wherein the driving time of the first driving signal is less than or equal to 20% of the duration corresponding to each of the above-mentioned first driving frames, and the driving duration of the photosensitive device is reduced to reduce the offset degree of the threshold voltage of the photosensitive device. During the process of the first driving signal, the driving chip is controlled to perform IC sampling. After the photosensitive stage, the control driving module sends a touch signal to the Vcom signal terminal to enter the touch stage (touch stage), and a first driving frame ends.

[0052] In some optional embodiments, such as Fig.10 and Fig.11 As shown, the above-mentioned first driving signal also includes a negative voltage driving signal, and the above-mentioned driving method also includes: a third control step: when the above-mentioned driving module performs display driving on the above-mentioned display panel, the above-mentioned driving module is controlled to simultaneously send a first driving signal to the above-mentioned gate Vg and source Vd at a third moment, and the above-mentioned first driving frame corresponding to the above-mentioned third moment is located after the above-mentioned first driving frame corresponding to the above-mentioned first moment.

[0053] In the above optional implementation, if Fig.10 As shown, the above-mentioned driving module sends a display driving signal STV to enter the display stage, and inputs a common voltage signal to the Vcom signal terminal. It can also apply a negative voltage driving signal to the source Vd during the second first driving frame after the first first driving frame ends, and at the same time apply a positive voltage driving signal to the gate Vg, so that the photosensitive device is turned on during the photosensitive stage and turned off after the photosensitive stage ends. And subsequently, the positive and negative voltage signals are used to alternately drive the photosensitive device to correct the offset of the photosensitive device. Fig.11 As shown, Fig.11 The timing diagram in Fig.10 In the second first driving frame of the timing diagram in FIG. 1 , a positive voltage driving signal is applied to the source electrode Vd, and a negative voltage driving signal is applied to the gate electrode Vg. Fig.12 As shown, Fig.10The difference is that during the second first driving frame after the first first driving frame ends, negative voltage driving signals are applied to the source Vd and the gate Vg at the same time, so that the photosensitive device is turned on during the light sensing stage and turned off after the light sensing stage ends. Subsequently, the photosensitive device is alternately driven by positive and negative voltage signals to correct the offset of the photosensitive device. Fig.10 and Fig.12 The touch control phase and sampling voltage at the Vcom signal end are Fig. 9 According to the voltage offset degree of the photosensitive device, those skilled in the art can reasonably adjust the driving time of the positive voltage driving signal and the negative voltage driving signal. The driving time of the positive voltage driving signal and the negative voltage driving signal can be inconsistent or consistent.

[0054] In some optional embodiments, such as Fig.13 As shown, the driving method further includes: controlling the driving module to send a start signal STV to perform display driving on the display panel, executing the first control step and the third control step during the display driving process, or executing the first control step and the third control step within a preset time period after the display driving ends.

[0055] In the above optional implementation, if Fig.13 As shown, in the first first drive frame, a continuous DC drive can be applied to the gate Vg during the display phase, and a first drive signal can be applied to the source Vd at the same time. In the second first drive frame, the first drive signal can be applied to the source Vd after the display phase ends. In the first first drive frame, the first drive signal can be applied to the source Vd after the display phase ends. In the second first drive frame, the first drive signal can be applied to the source Vd during the display phase. The above-mentioned first drive signal includes a positive voltage drive signal or a negative voltage drive signal. In other words, the STV signal of the first drive frame may overlap with the time corresponding to the first drive signal of the light sensing phase, or the time corresponding to the first drive signal is after the end of the STV signal of the drive frame. In the case where there are multiple driving methods as above during the driving process, the present application Fig.13 This is for illustration only and no specific limitation is given here. Fig.13 The touch control phase and sampling voltage at the Vcom signal end are Fig. 9 It is consistent with the description in . It should be noted that Fig.13 It is described that the gate Vg and source Vd drive signals can be basically synchronized with the STV signal, which is also applicable to Figure 3 to Figure 12 Implementation plan in .

[0056] The above-mentioned STV signal, also called the scan drive start pulse signal, can be generated by the scan driver IC. The scan driver IC is responsible for controlling the opening and closing of the scan line of the scan circuit, and the STV signal is one of the key control signals, which is used to indicate the start of the scan line. When the gate driver GATE DRIVER receives the STV signal, it is ready to start the first field scan, and the source driver SOURCE DRIVER releases the first line data signal, thereby realizing the update of the display screen. This process is carried out in a cycle, ensuring the continuous update and correct display of the display content.

[0057] In some optional embodiments, such as Fig.14 and Fig.15 As shown, the third control step further includes: the first drive frames corresponding to N adjacent first moments and the first drive frames corresponding to N adjacent third moments are run alternately, N=1, 2, . . . , N.

[0058] In the above optional implementation manner, the first first driving frame includes the first moment, and the second first driving frame includes the second moment. In the process of driving the photosensitive device, the first first driving frame and the second first driving frame may appear alternately, for example, Fig.14 As shown, a first first driving frame with a first moment appears first, that is, the first driving signal is a positive voltage driving signal, and then a second first driving frame with a third moment appears, that is, the first driving signal is a negative voltage driving signal, that is, a first driving frame with a first moment and a first driving frame with a third moment appear alternately; for example, as Fig.15 As shown, N first drive frames with a first moment may appear first, that is, the first drive signal is a positive voltage drive signal, and then N second first drive frames with a third moment may appear, that is, the first drive signal is a negative voltage drive signal, that is, N first drive frames with a first moment and N first drive frames with a third moment appear alternately, such as, 2 first drive frames with a first moment appear first, and then 3 first drive frames with a third moment appear, or, 5 first drive frames with a first moment appear first, and then 5 first drive frames with a third moment appear, and so on. Fig.14 and Fig.15 Description of various signals in Fig.10 The consistency in .

[0059] In some optional embodiments, such as Fig.16As shown, the driving method further includes a first loop step, wherein the first loop step includes looping the first control step, the second control step and the sampling step, wherein the first drive frames corresponding to adjacent first moments are spaced apart by M second drive frames, where M=1, 2, ..., 20, and the first drive signal is not included in the duration corresponding to the second drive frame, and the duration corresponding to the second drive frame is consistent with the duration corresponding to the first drive frame.

[0060] In the above optional implementation, if Fig.16 As shown, the first drive frame: the above-mentioned drive module sends a display drive signal STV to enter the display stage, and inputs a common voltage signal to the Vcom signal terminal, controls the drive module to connect the gate Vg to a continuous DC drive, so that the above-mentioned photosensitive device is turned on and enters the photosensitive stage, and at the same time controls the drive module to apply a first drive signal to the source Vd of the photosensitive device to drive the photosensitive device, and controls the drive chip to sample during the first drive signal. After the photosensitive stage, the control drive module sends a touch signal to the Vcom signal terminal to enter the touch stage (touch stage). The second drive frame: the above-mentioned drive module sends a display drive signal STV to enter the display stage, the gate Vg is still connected to a continuous DC drive, and the Vcom signal terminal is always connected to the common voltage signal. There are M second drive frames after the first first drive frame, and the second first drive frame comes after the M second drive frames. In this cycle, the first drive frame and the M second drive frames can be regarded as a large drive frame. The duration of applying the first drive signal to the source Vd includes 300μs~8.3ms, and the photosensitive device is driven by frame skipping. The corresponding duration of the above-mentioned large drive frame and the second first drive frame is controlled to include 16.67ms~100ms, which can further reduce the proportion of the duration of the first drive signal in the large drive frame and reduce the impact on the photosensitive device. Fig.16 The first driving signal applied to the source electrode Vd in the second first driving frame may also be applied after the display phase.

[0061] During use, the display panel uses seconds as the response time, and the above-mentioned drive frame is measured in milliseconds. Those skilled in the art can appropriately increase the value of M without affecting the use of the display panel.

[0062] In some optional implementations, the duration corresponding to the first driving signal accounts for 5% to 20% of the duration corresponding to the first driving frame and N second driving frames consecutive to the first driving frame.

[0063] In the above optional implementation, during the frame skipping driving process, the corresponding duration of the above-mentioned first driving signal is controlled within 5% to 20% of the corresponding duration of the above-mentioned large driving frame, and the alternating driving of positive and negative voltage driving signals can also be added during the frame skipping driving process. On the one hand, the time for the photosensitive device to receive the photosensitive drive is reduced, and on the other hand, the alternating driving of the positive and negative voltage driving signals can also reduce the correction of the photosensitive device, which can effectively reduce the directional deviation of the photosensitive device and increase the service life of the device.

[0064] In some optional embodiments, such as Fig.17 and Fig.18 As shown, the driving method further includes a second loop step, wherein the second loop step includes looping the first control step, the second control step, the sampling step, the third control step and the second control step, wherein the first drive frame corresponding to the first moment in the same second loop step and the first drive frame corresponding to the third moment in the same second loop step are separated by M second drive frames, M=1, 2, ..., 20, the first drive signal is not included in the duration corresponding to the second drive frame, and the duration corresponding to the second drive frame is consistent with the duration corresponding to the first drive frame.

[0065] In the above optional implementation, if Fig.17 As shown, the first control step (light sensing stage) in the first driving frame and the second driving frame, the second control step (touch stage), and the description of the sampling step are the same as Fig.16 , wherein the first drive signal in the first control step is a positive voltage drive signal; the third control step and the second control step can be executed in the second first drive frame after M second drive frames to complete the cycle, that is, to send a display drive signal STV to the above drive module to enter the display stage, and control the drive module to apply a negative voltage drive signal to the source Vd of the photosensitive device to drive the photosensitive device to enter the photosensitive stage. When a negative voltage drive signal is applied to the source Vd or the gate Vg, it may not be sampled. Among them, the corresponding duration of the positive voltage drive signal or the corresponding duration of the negative voltage drive signal includes 300μs~8.3ms; the total duration from the first drive frame corresponding to the positive voltage drive signal to the first drive frame corresponding to the negative voltage drive signal includes 16.67ms~100ms. As Fig.18As shown, after executing N times of the first drive frame including the first control step, the second control step and the sampling step and M times of the second drive frame, N times of the first drive frame including the third control step and the second control step and M times of the second drive frame can be executed to complete the cycle. Among them, the corresponding duration of the positive pressure drive signal includes 300μs~8.3ms; the total duration from the first drive frame corresponding to the first positive pressure drive signal to the first drive frame corresponding to the second positive pressure drive signal includes 16.67ms~100ms. Fig.18 Description and Fig.17 Consistent.

[0066] According to another embodiment of the present application, Fig.19 As shown, a light sensing circuit is also provided, the light sensing circuit adopts the above-mentioned driving method of the light sensing device, and the above-mentioned light sensing circuit includes: a light sensing circuit 50, including a light sensing device 10 and a reference device 20, the gate Gate of the above-mentioned light sensing device 10 is electrically connected to the gate Gate of the above-mentioned reference device 20, the source Source of the above-mentioned light sensing device 10 is electrically connected to the source Source of the above-mentioned reference device 20, and the above-mentioned reference device 20 is at least used to compare the offset degree of the above-mentioned light sensing device 10; a sampling circuit 60, including a processor 61, and the above-mentioned light sensing device 10 and the above-mentioned reference device 20 are electrically connected to the above-mentioned processor 61 respectively.

[0067] The above-mentioned light sensing circuit of the present application includes a light sensing circuit and a sampling circuit, wherein the sampling circuit is a circuit in a driving chip, and the light sensing device and the reference device of the light sensing circuit are electrically connected to the processor in the sampling circuit. By adopting the above-mentioned driving method of the light sensing device, the risk of directional drift of the light sensing device is reduced, and the problem in the prior art that the light sensing device is prone to directional drift when continuously powered on, resulting in failure of the light sensing device, thereby improving the service life of the light sensing circuit and making the signal output by the light sensing circuit more accurate.

[0068] In some optional embodiments, such as Fig.19 As shown, the light sensing circuit further includes a plurality of voltage divider resistors 31 , one end of the voltage divider resistor 31 is electrically connected to the drain Drain of the light sensing device 10 or the reference device 20 , and the other end of the voltage divider resistor 31 is grounded.

[0069] In the above optional implementation, if Fig.19 As shown, the circuit of the flexible circuit board 30 includes a plurality of the above-mentioned voltage-dividing resistors 31 . The voltage-dividing resistors 31 convert the current signal in the photosensitive circuit into a voltage signal, and the above-mentioned sampling circuit 60 samples the above-mentioned voltage signal.

[0070] In some optional embodiments, such as Fig.19As shown, the sampling circuit 60 further includes a plurality of digital-to-analog converters 62 and a plurality of filters 63, wherein: the filter 63 is electrically connected to the drain of the photosensitive device 10 or the reference device 20; the digital-to-analog converter 62 is electrically connected to the filter 63 and the processor 61, respectively, and the number of the filters 63 corresponds to the number of the digital-to-analog converters 62.

[0071] In the above optional implementation, if Fig.19 As shown, the filter 63 in the sampling circuit 60 filters out impurities in the electrical signal output by the photosensitive circuit 50, and then converts the electrical signal into a digital signal for output through the digital-to-analog converter 62, thereby controlling the light emission of the pixel circuit in the display panel to adjust the backlight brightness of the display panel.

[0072] It should be noted that Figures 3 to 18 The driving time of the positive voltage driving signal and the negative voltage driving signal shown in the figure are basically the same. In actual operation, technical personnel in this field can reasonably adjust the driving time of the positive voltage driving signal and the negative voltage driving signal according to the voltage offset of the photosensitive device. The driving time of the two can be consistent or inconsistent.

[0073] According to another embodiment of the present application, Fig. 20 As shown, a display device 1 is provided, wherein the area of ​​the display device 1 other than the display area 2 is a non-display area, and the non-display area includes the light sensing circuit.

[0074] Specifically, the display device may be an electronic device such as a mobile phone, a computer, and a television, and the display panel may be applied thereto.

[0075] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0076] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for driving a photosensitive device, characterized in that: The photosensitive device is located in a non-display area of ​​the display panel, the photosensitive device is electrically connected to a driving module, and the driving method includes: A first control step: when the driving module drives the display panel to display, controlling the driving module to send a first driving signal to the photosensitive device at a first moment, wherein the first driving signal includes a positive voltage driving signal, and the duration of the positive voltage driving signal is less than or equal to 20% of the duration corresponding to each first driving frame, and the duration corresponding to the first driving frame has a preset relationship with the driving frequency of the driving module; A second control step: controlling the driving module to send a touch signal at a second moment, wherein the second moment is after the end moment of the duration of the first driving signal, and the duration corresponding to each of the first driving frames includes at least one first driving signal and one touch signal; Sampling step: controlling the driving module to perform sampling detection on the photosensitive device within the duration of the first driving signal.

2. The driving method according to claim 1, characterized in that: Controlling the driving module to send a first driving signal to the light sensing device at a first moment includes: Controlling the driving module to perform direct current driving on the gate of the photosensitive device; The driving module is controlled to send a positive voltage driving signal to the source electrode of the photosensitive device at the first moment, and the duration of the positive voltage driving signal is less than or equal to 20% of the duration corresponding to each of the first driving frames.

3. The driving method according to claim 1, characterized in that: Controlling the driving module to send a first driving signal to the light sensing device at a first moment includes: Controlling the driving module to perform direct current driving on the source of the photosensitive device; The driving module is controlled to send the positive voltage driving signal to the gate of the photosensitive device at the first moment, and the duration of the positive voltage driving signal is less than or equal to 20% of the duration corresponding to each of the first driving frames.

4. The driving method according to claim 1, characterized in that: Controlling the driving module to send a first driving signal to the light sensing device at a first moment includes: The driving module is controlled to simultaneously send the positive voltage driving signal to the gate electrode and the source electrode of the photosensitive device, and the duration of the positive voltage driving signal is less than or equal to 20% of the duration corresponding to each of the first driving frames.

5. The driving method according to claim 2, characterized in that: The first driving signal further includes a negative voltage driving signal, and the driving method further includes: The third control step: when the driving module drives the display panel for display, controlling the driving module to send the negative voltage driving signal to the source at a third moment, and the first driving frame corresponding to the third moment is located after the first driving frame corresponding to the first moment.

6. The driving method according to claim 3, characterized in that: The first driving signal further includes a negative voltage driving signal, and the driving method further includes: The third control step: when the driving module drives the display panel for display, controlling the driving module to send the negative voltage driving signal to the gate at a third moment, and the first driving frame corresponding to the third moment is located after the first driving frame corresponding to the first moment.

7. The driving method according to claim 4, characterized in that: The first driving signal further includes a negative voltage driving signal, and the driving method further includes: The third control step: when the driving module drives the display panel for display, controlling the driving module to send the first driving signal to the gate at the third moment, and the first driving frame corresponding to the third moment is located after the first driving frame corresponding to the first moment.

8. The driving method according to any one of claims 5 to 7, characterized in that: The third control step further includes: the first drive frames corresponding to N adjacent first moments and the first drive frames corresponding to N adjacent third moments are run alternately, N=1, 2, . . . , N.

9. The driving method according to claim 1, characterized in that: The driving method also includes a first loop step, wherein the first loop step includes looping the first control step, the second control step and the sampling step, wherein the first drive frames corresponding to adjacent first moments are separated by M second drive frames, where M=1, 2, ..., 20, and the first drive signal is not included in the duration corresponding to the second drive frame, and the duration corresponding to the second drive frame is consistent with the duration corresponding to the first drive frame.

10. The driving method according to claim 9, characterized in that: The duration corresponding to the first driving signal accounts for 5% to 20% of the duration corresponding to the first driving frame and N second driving frames consecutive to the first driving frame.

11. The driving method according to any one of claims 5 to 7, characterized in that: The driving method also includes a second loop step, wherein the second loop step includes looping the first control step, the second control step, the sampling step, the third control step and the second control step, wherein the first drive frame corresponding to the first moment in the same second loop step and the first drive frame corresponding to the third moment in the same second loop step are separated by M second drive frames, where M=1, 2, ..., 20, and the first drive signal is not included in the duration corresponding to the second drive frame, and the duration corresponding to the second drive frame is consistent with the duration corresponding to the first drive frame.

12. The driving method according to claim 8, characterized in that: The driving method further comprises: Control the driving module to send a start signal to drive the display panel, and perform the first control step and the third control step during the display driving process, or, The first control step and the third control step are performed within a preset time period after the display driving is completed.

13. A light sensing circuit, characterized in that: The light sensing circuit adopts the driving method of the light sensing device according to any one of claims 1 to 12, and the light sensing circuit comprises: A photosensitive circuit, comprising a photosensitive device and a reference device, wherein a gate of the photosensitive device is electrically connected to a gate of the reference device, a source of the photosensitive device is electrically connected to a source of the reference device, and the reference device is at least used to compare the degree of deviation of the photosensitive device; The sampling circuit comprises a processor, and the photosensitive device and the reference device are electrically connected to the processor respectively.

14. The light sensing circuit according to claim 13, characterized in that: The sampling circuit further includes a plurality of digital-to-analog converters and a plurality of filters, wherein: The filter is electrically connected to the drain of the photosensitive device or the reference device; The digital-to-analog converters are electrically connected to the filters and the processor respectively, and the number of the filters corresponds to the number of the digital-to-analog converters.

15. The light sensing circuit according to claim 14, characterized in that: The light sensing circuit further comprises a plurality of voltage-dividing resistors, one end of each voltage-dividing resistor is electrically connected to the drain of the light sensing device or the reference device, and the other end of each voltage-dividing resistor is grounded.

16. A display device, characterized in that: Comprising the light sensing circuit as claimed in any one of claims 13 to 15.

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