An image sensor driving system, a driving method, and an image sensor

Abstract

The application discloses an image sensor driving system, a driving method and an image sensor. The image sensor driving system comprises a bidirectional driving circuit and a signal generating circuit. The signal generating circuit is used for generating a driving signal and an enabling signal. The bidirectional driving circuit comprises a forward driving circuit and a reverse driving circuit arranged oppositely. A first input end of the forward driving circuit and a first input end of the reverse driving circuit jointly receive the enabling signal. A second input end of the forward driving circuit and a second input end of the reverse driving circuit jointly receive the driving signal. The enabling signal is generated based on a time difference between the first driving signal and the second driving signal. The forward driving circuit and the reverse driving circuit respectively output the first driving signal and the second driving signal according to the enabling signal and the driving signal. The application can control the output of the first driving signal and the second driving signal according to the enabling signal, and eliminate the competition and risk of the signals.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of image processing, and in particular, to an image sensor driving system, a driving method and an image sensor. BACKGROUND

[0002] With the development of technology, computing devices are gradually applied to various aspects of modern society and have made great contributions to the development of modern society, including but not limited to digital cameras, video cameras, smart phones, navigation systems, etc. In particular, in recent years, devices with image acquisition functions such as digital cameras have become more and more popular, and the imaging quality requirements are getting higher and higher.

[0003] The existing image sensor adopts a unidirectional driving pixel array for converting optical signals into electrical signals. However, when driving the pixel array unidirectionally, the driving voltage decreases due to signal line transmission loss when transmitting from one end of the pixel array to the other end, so that the driving of one end of the pixel array is stronger and the driving of the other end is weaker, which will reduce the quality of the generated image. In order to solve this problem, a bidirectional driving method can be used to drive the pixel array, that is, both ends of the pixel array can receive driving signals for driving, so as to reduce the problem of large voltage difference of the driving voltage received at both ends of the pixel array. However, bidirectional driving may have a driving delay, which will cause logical competition and risk of driving voltage, and reduce the quality of the generated image. SUMMARY

[0004] The purpose of the present application is to provide an image sensor driving system, a driving method and an image sensor, which solves the problem of competition and risk caused by delay in bidirectional driving.

[0005] The application provides an image sensor driving system, which comprises a bidirectional driving circuit and a signal generating circuit connected to the bidirectional driving circuit, the signal generating circuit being used to generate a driving signal and an enabling signal to control the bidirectional driving circuit to bidirectionally drive a pixel array of an image sensor, wherein: the bidirectional driving circuit comprises a forward driving circuit and a reverse driving circuit arranged oppositely, a first input end of the forward driving circuit and a first input end of the reverse driving circuit jointly receive the enabling signal, a second input end of the forward driving circuit and a second input end of the reverse driving circuit jointly receive the driving signal, and the forward driving circuit and the reverse driving circuit simultaneously drive the pixel array from a forward direction and a reverse direction according to the enabling signal and the driving signal; wherein the driving signal received by the second input end of the forward driving circuit is a first driving signal after being input to the pixel array of the image sensor, and the driving signal received by the second input end of the reverse driving circuit is a second driving signal after being input to the pixel array of the image sensor; the output end of the signal generating circuit is connected to the first input end of the forward driving circuit and the first input end of the reverse driving circuit to provide the enabling signal, and the signal generating circuit generates the enabling signal according to the time difference existing when bidirectionally driving the pixel array from the first driving signal and the second driving signal to eliminate the signal competition relationship of bidirectional driving.

[0006] In an embodiment, the signal generating circuit comprises a delay control module and a delay operation module, the delay operation module is used to generate the enabling signal; the delay control module comprises a first delay unit and a second delay unit, the input end of the first delay unit and the output end of the second delay unit are connected to the delay operation module, the input end of the first delay unit receives a first time signal, the control end of the first delay unit is connected to a first delay control signal, the first delay unit generates the driving signal based on the first time signal and the first delay control signal, and the starting time of the first time signal is earlier than that of the driving signal; the input end of the second delay unit is connected to the output end of the first delay unit to receive the driving signal, the control end of the second delay unit is connected to a second delay control signal, the second delay unit generates a second time signal based on the driving signal and the second delay control signal, and the starting time of the second time signal is later than that of the driving signal; the input end of the delay operation module is connected to the input end of the first delay unit and the output end of the second delay unit to generate the enabling signal based on the first time signal and the second time signal.

[0007] In an embodiment, the starting time difference between the first time signal and the second time signal is not shorter than the time difference between the first driving signal and the second driving signal.

[0008] In one embodiment, a time difference between the start of the first driving signal and the second driving signal is not shorter than a time difference between the start of the first time signal and the second time signal.

[0009] In one embodiment, the delay operation module comprises an exclusive-OR gate circuit, a first input end of the exclusive-OR gate circuit is connected to the first delay unit, a second input end of the exclusive-OR gate circuit is connected to the second delay unit, an output end of the exclusive-OR gate circuit is connected to a first input end of the forward driving circuit and a first input end of the reverse driving circuit, and the exclusive-OR gate circuit is configured to perform exclusive-OR operation on the first time signal and the second time signal to generate an enable signal and output the enable signal.

[0010] In one embodiment, the forward driving circuit and the reverse driving circuit each comprise a driving control unit and a driving unit, the driving unit is configured to drive the pixel array, and the driving control unit is configured to control the driving unit to drive the pixel array according to the enable signal.

[0011] In one embodiment, a third input end of the forward driving circuit is further connected to a forward gate signal, and a third input end of the reverse driving circuit is further connected to a reverse gate signal.

[0012] In one embodiment, the forward driving circuit comprises a first driving control unit and a first driving unit, the forward gate signal and the enable signal are connected to the first driving control unit, the first driving control unit is configured to control the first driving unit to drive the pixel array based on the first driving signal according to the forward gate signal and the enable signal, and the reverse driving circuit comprises a second driving control unit and a second driving unit, the reverse gate signal and the enable signal are connected to the second driving control unit, and the second driving control unit is configured to control the second driving unit to drive the pixel array based on the second driving signal according to the reverse gate signal and the enable signal.

[0013] In one embodiment, the first driving control unit and the second driving control unit each comprise a driving operation circuit and a switch circuit, the driving operation circuit is configured to control the switch circuit to be on or off based on the enable signal and the forward gate signal or the reverse gate signal, so as to control whether the first driving unit and the second driving unit are connected to a working voltage.

[0014] The application further provides a driving method of the image sensor driving system, comprising: inputting a first time signal to a delay control circuit, the first time signal generates a driving signal through a first delay unit, and the first delay unit makes the output time of the first time signal earlier than the output time of the driving signal; the driving signal generates a second time signal through a second delay unit, and the second delay unit makes the output time of the second time signal later than the output time of the driving signal, wherein the output time difference between the first time signal and the second time signal is not shorter than the time difference between the first driving signal and the second driving signal; inputting the first time signal and the second time signal to a delay operation module, and the delay operation module performs logical operation on the first time signal and the second time signal to generate an enable signal; and providing the enable signal to a bidirectional driving circuit, and the enable signal controls the bidirectional driving circuit to bidirectionally drive the pixel array based on the time difference between the first driving signal and the second driving signal, so as to eliminate the competition relationship of the bidirectionally driven signals.

[0015] In one embodiment, when the image sensor driving system is configured to be bidirectionally driven, the forward gate signal and the reverse gate signal are turned on.

[0016] In one embodiment, when the image sensor driving system is configured to be unidirectionally driven, the forward gate signal or the reverse gate signal is turned on, wherein: when the forward gate signal is turned on, the first driving operation unit performs logical operation to control the first driving signal output when the enable signal is input to the first driving operation unit; and when the reverse gate signal is turned on, the second driving operation unit performs logical operation to control the second driving signal output when the enable signal is input to the second driving operation unit.

[0017] In one embodiment, the delay operation module performs exclusive OR logical operation on the first time signal and the second time signal.

[0018] In one embodiment, the first driving operation unit and the second driving operation unit both perform OR logical operation.

[0019] The application further provides an image sensor comprising the image sensor driving system.

[0020] The image sensor driving system, the driving method and the image sensor described above can control the output of the first driving signal and the second driving signal based on the time difference between the first driving signal and the second driving signal according to the enable signal, so as to eliminate the competition and risk of bidirectional driving of the first driving signal and the second driving signal, thereby achieving the effect of balancing the bidirectional driving capability. BRIEF DESCRIPTION OF DRAWINGS

[0021] The specific embodiments of the present application will be described below in detail with reference to the accompanying drawings.

[0022] Figure 1 The connection diagram of the image sensor driving system of an embodiment of the present application.

[0023] Figure 2 The signal timing diagram of the image sensor driving system of an embodiment of the present application.

[0024] Figure 3 The connection diagram of the image sensor driving system of another embodiment of the present application.

[0025] Figure 4 The signal timing diagram of the image sensor driving system of another embodiment of the present application.

[0026] Figure 5 The flow chart of the driving method of the image sensor driving system of an embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described below in detail with reference to the accompanying drawings.

[0028] Figure 1 The connection diagram of the image sensor driving system of an embodiment of the present application. As shown in FIG. 1, the image sensor driving system of the embodiment of the present application comprises a pixel array 10, a row driver 20, a column driver 30, a timing controller 40, a vertical driver 50, a horizontal driver 60, a signal processing unit 70, a memory 80, a display unit 90 and a control unit 100. Figure 1As shown, the image sensor driving system comprises a bidirectional driving circuit X and a signal generating circuit Y connected to the bidirectional driving circuit X, the signal generating circuit Y is used to generate a driving signal B and an enable signal enable to control the bidirectional driving circuit X to bidirectionally drive the pixel array of the image sensor, wherein: the bidirectional driving circuit X comprises a forward driving circuit X1 and a reverse driving circuit X2 arranged oppositely, the first input end of the forward driving circuit X1 and the first input end of the reverse driving circuit X2 commonly receive the enable signal enable, the second input end of the forward driving circuit X1 and the second input end of the reverse driving circuit X2 commonly receive the driving signal B, the forward driving circuit X1 and the reverse driving circuit X2 simultaneously drive the pixel array from the forward and reverse directions according to the enable signal enable and the driving signal B; wherein the driving signal B received by the second input end of the forward driving circuit X1 is a first driving signal B1 after input to the pixel array of the image sensor, and the driving signal B received by the second input end of the reverse driving circuit X2 is a second driving signal B2 after input to the pixel array of the image sensor. The output end of the signal generating circuit Y is connected to the first input end of the forward driving circuit X1 and the first input end of the reverse driving circuit X2 to provide the enable signal enable, and the signal generating circuit Y generates the enable signal enable according to the time difference existing when bidirectionally driving the pixel array by the first driving signal B1 and the second driving signal B2 to eliminate the signal competition relationship of bidirectional driving.

[0029] In particular, as Figure 1As shown, the image sensor driving system includes a bidirectional driving circuit X and a signal generating circuit Y, the bidirectional driving circuit X includes a forward driving circuit X1 and a reverse driving circuit X2 arranged oppositely. A first input terminal of the forward driving circuit X1 receives an enable signal enable, a second input terminal of the forward driving circuit X1 receives a driving signal B, the driving signal B is delayed to generate a first driving signal B1, the forward driving circuit X1 controls the first driving signal B1 input to the pixel array according to the enable signal enable, to drive the pixel array forward based on the first driving signal B1. A first input terminal of the reverse driving circuit X2 receives the enable signal enable, a second input terminal of the reverse driving circuit X2 receives the driving signal B, the driving signal B is delayed to generate a second driving signal B2, the reverse driving circuit X2 controls the input to the pixel array according to the enable signal enable, to drive the pixel array reverse based on the second driving signal B2. Wherein, the reason of the delay of the driving signal B can be the signal delay caused by the wire in the process from the end receiving the driving signal B to the end input to the pixel array, or the signal delay caused by one or more electronic elements in the wire, such as inverter, MOS tube, etc. Thus, the time difference between the first driving signal B1 and the second driving signal B2 is related to the direction of the source of the driving signal B and the length of the pixel array. If the driving signal B is transmitted from the middle of the pixel array to the left and right sides of the pixel array, the time difference between the first driving signal B1 and the second driving signal B2 is smaller; if the driving signal B is transmitted from the left or right side of the pixel array to the left and right sides of the pixel array, the time difference between the first driving signal B1 and the second driving signal B2 is larger, and will change according to the length of the pixel array, that is, the longer the length of the pixel array, the larger the delay between the first driving signal B1 and the second driving signal B2.

[0030] The forward driving circuit X1 and the reverse driving circuit X2 are both controlled according to the enable signal enable generated by the signal generating circuit Y. When the first driving signal B1 and the second driving signal B2 exist in time difference during bidirectional driving of the pixel array, the signal generating circuit Y generates the enable signal enable according to the time difference, and then controls the bidirectional driving circuit X to not output the first driving signal B1 and the second driving signal B2 according to the enable signal enable when the first driving signal B1 and the second driving signal B2 exist in competition and risk, and controls the bidirectional driving circuit X to output the first driving signal B1 and the second driving signal B2 according to the enable signal enable when the first driving signal B1 and the second driving signal B2 do not exist in competition and risk. In an embodiment, the low level period of the enable signal enable can include the time period in which the first driving signal B1 and the second driving signal B2 input to the pixel array cause the signal competition relationship of bidirectional driving, the forward driving circuit X1 can stop outputting the first driving signal B1 according to the low level period of the enable signal enable, the reverse driving circuit X2 can stop outputting the second driving signal B2 according to the low level period of the enable signal enable, and the competition and risk between the first driving signal B1 and the second driving signal B2 are eliminated. When the first driving signal B1 and the second driving signal B2 do not exist in competition and risk, the enable signal enable is high, the forward driving circuit X1 can input the first driving signal B1 to the pixel array, and at the same time, the reverse driving circuit X2 can input the second driving signal B2 to the pixel array, and at this time, the competition and risk of the signals will not occur. Therefore, the image sensor driving system of the embodiment can control the output of the first driving signal B1 and the second driving signal B2 according to the time difference between the first driving signal B1 and the second driving signal B2 based on the enable signal enable, so as to eliminate the competition and risk of the first driving signal B1 and the second driving signal B2 during bidirectional driving, thereby achieving the effect of balancing the bidirectional driving capability.

[0031] Figure 2 The signal timing diagram of the image sensor driving system of an embodiment of the present application is shown in FIG. 3. As shown in FIG. 3, Figure 2 Figure 2 ​The timing diagram of the first driving signal B1 generated by the driving signal B due to the delay, the timing diagram of the second driving signal B2 generated by the driving signal B due to the delay, and the timing diagram of the enable signal are shown. The low level time period of the enable signal includes the time difference existing when the first driving signal B1 and the second driving signal B2 bidirectionally drive the pixel array, that is, the time period from low level to high level of the first driving signal B1, the time period from low level to high level of the second driving signal B2, and can also include the time period from high level to low level of the first driving signal B1, the time period from high level to low level of the second driving signal B2. The forward driving circuit X1 controls the first driving signal B1 not to be input to the pixel array according to the low level of the enable signal, and the reverse driving circuit X2 controls the second driving signal B2 not to be input to the pixel array according to the low level of the enable signal. Thus, when the enable signal is high, the forward driving circuit X1 controls the first driving signal B1 to be input to the pixel array according to the high level of the enable signal, and the reverse driving circuit X2 controls the second driving signal B2 to be input to the pixel array according to the high level of the enable signal, so as to eliminate the competition and risk when the first driving signal B1 and the second driving signal B2 bidirectionally drive, and avoid the generation of unstable signals such as interference pulses, so as to balance the bidirectional driving capability.

[0032] However, the first driving signal B1, the second driving signal B2 and the enable signal of the present application are not limited to Figure 2 the signal timing shown, as long as the competition and risk caused by the delay between the first driving signal B1 and the second driving signal B2 are satisfied, and the time difference existing when the first driving signal B1 and the second driving signal B2 bidirectionally drive the pixel array is included in the low level time period of the enable signal, which belongs to the protection scope of the present application.

[0033] In addition, the embodiment of the present application is not limited to bidirectionally driving the pixel array, and can be applied to other driving circuits with long transmission lines.

[0034] Figure 3 The connection schematic diagram of the signal generation circuit Y in the image sensor driving system of another embodiment of the present application is shown. Figure 4 The signal timing diagram of the image sensor driving system of another embodiment of the present application is shown. The description of the embodiment is made below in combination with Figure 3 and Figure 4 .

[0035] In an embodiment, as Figure 3 shown, the signal generation circuit Y includes a delay control module 210 and a delay operation module 220, and the delay operation module 220 is used to generate the enable signal.

[0036] The delay control module 210 includes a first delay unit M1 and a second delay unit M2. The input terminal of the first delay unit M1 and the output terminal of the second delay unit M2 are connected to the delay operation module 220. The input terminal of the first delay unit M1 receives the first time signal A. The control terminal of the first delay unit M1 receives the first delay control signal delay_ctrl_1. The first delay unit M1 generates the driving signal B based on the first time signal A and the first delay control signal delay_ctrl_1, and makes the start time of the first time signal A earlier than the driving signal B. The input terminal of the second delay unit M2 is connected to the output terminal of the first delay unit M1 to receive the driving signal B. The control terminal of the second delay unit M2 receives the second delay control signal delay_ctrl_2. The second delay unit M2 generates the second time signal C based on the driving signal B and the second delay control signal delay_ctrl_2, and makes the start time of the second time signal C later than the driving signal B.

[0037] The input terminal of the delay operation module 220 is connected to the input terminal of the first delay unit M1 and the output terminal of the second delay unit M2 to generate the enable signal enable based on the first time signal A and the second time signal C.

[0038] Specifically, referring to Figure 3 and Figure 4 , the first delay unit M1 receives the first time signal A and the first delay control signal delay_ctrl_1, and generates the driving signal B accordingly, wherein the start time of the first time signal A is earlier than the driving signal B. The output terminal of the first delay unit M1 sends the driving signal B to the input terminal of the second delay unit M2. The control terminal of the second delay unit M2 receives the second delay control signal delay_ctrl_2. The second delay unit M2 generates the second time signal C based on the driving signal B and the second delay control signal delay_ctrl_2, and makes the start time of the second time signal C later than the driving signal B. In an embodiment, the first delay unit M1 and the second delay unit M2 can be a multi-stage inverter connection structure circuit, an RC low-pass filter structure circuit, or a combination of a multi-stage inverter structure and an RC low-pass filter structure, to meet the requirement of generating different delay differences.

[0039] Therefore, the delay operation module 220 can generate the enable signal enable based on the first time signal A and the second time signal C, for example Figure 4In some embodiments, the enable signal enable is low when the first time signal A is high and the second time signal C is low, and the enable signal enable is low when the first time signal A is low and the second time signal C is high. Thus, by controlling the time delay between the first time signal A and the driving signal B, and the time delay between the driving signal B and the second time signal C, the enable signal enable can be generated by the delay operation module 220 according to the first time signal A and the second time signal C, and the time period of the enable signal enable, for example, the low time period, includes the time period when the first driving signal B1 and the second driving signal B2 exist in competition and risk, and the different time delay requirements of the bidirectional driving signal B can be met. As shown in Figure 4 the time period of the time delay between the first time signal A and the second time signal C is realized by the controllable delay, and the time period of the time delay between the first driving signal B1 and the second driving signal B2 generated by the delay of the driving signal B, i.e. the controllable delay difference, is greater than the time length of the competition and risk of the bidirectional driving signal B. Thus, the low time period of the enable signal enable includes the time period when the first driving signal B1 and the second driving signal B2 are input to the pixel array to cause the signal competition relationship of bidirectional driving. Thus, the output of the first driving signal B1 and the second driving signal B2 can be controlled according to the time difference of the first driving signal B1 and the second driving signal B2 based on the enable signal enable, so as to eliminate the competition and risk of the first driving signal B1 and the second driving signal B2 when bidirectional driving is performed, thereby achieving the effect of balancing the bidirectional driving capability.

[0040] In an embodiment, the time difference between the start time of the first time signal A and the second time signal C is not shorter than the time difference between the first driving signal B1 and the second driving signal B2.

[0041] In an embodiment, the time difference between the start time of the first driving signal B1 and the second time signal C is not shorter than the time difference between the first driving signal B1 and the second driving signal B2.

[0042] In an embodiment, as shown in Figure 3 the delay operation module 220 can include an exclusive-OR gate circuit 221, the first input end of the exclusive-OR gate circuit 221 is connected to the first delay unit M1, the second input end of the exclusive-OR gate circuit 221 is connected to the second delay unit M2, the output end of the exclusive-OR gate circuit 221 is connected to the first input end of the forward driving circuit X1 and the first input end of the reverse driving circuit X2, and the exclusive-OR gate circuit 221 is used for exclusive-OR operation of the first time signal A and the second time signal C to generate the enable signal enable and output.

[0043] In an embodiment, as shown in Figure 3As shown, the forward driving circuit X1 and the reverse driving circuit X2 respectively include a driving control unit and a driving unit; the driving unit is used to drive the pixel array, and the driving control unit is used to control the driving unit to drive the pixel array according to the enable signal enable.

[0044] Specifically, the enable signal enable is generated according to the time difference existing when the pixel array is bidirectionally driven by the first driving signal B1 and the second driving signal B2, and the driving control unit receives the enable signal enable, and according to the enable signal enable, for example, when the enable signal enable is high, the driving control unit controls the driving unit to output the first driving signal B1 and the second driving signal B2 to drive the pixel array. The image sensor driving system of the embodiment includes a control unit and a driving unit, and can control the output of the first driving signal B1 and the second driving signal B2 based on the time difference existing between the first driving signal B1 and the second driving signal B2 according to the enable signal enable, so as to eliminate the time delay when the first driving signal B1 and the second driving signal B2 act on the pixel array, achieve the elimination of the signal competition relationship of bidirectional driving, and achieve the balancing effect of bidirectional driving capability.

[0045] In an embodiment, as shown in Figure 3 The third input end of the forward driving circuit X1 is further connected to the forward gate signal bypass_1, and the third input end of the reverse driving circuit X2 is further connected to the reverse gate signal bypass_r. Thus, the left end or the right end driving can be selected by the forward gate signal bypass_1 and the reverse gate signal bypass_r. For example, when bidirectional driving, the forward driving circuit X1 is selected by the forward gate signal bypass_1 to control the first driving signal B1 to be input to the pixel array according to the enable signal enable, and at the same time, the reverse driving circuit X2 is selected by the reverse gate signal bypass_r to control the second driving signal B2 to be input to the pixel array according to the enable signal enable. For example, when unidirectional driving, the forward driving circuit X1 is selected by the forward gate signal bypass_1 to control the first driving signal B1 to be input to the pixel array according to the enable signal enable, or the reverse driving circuit X2 is selected by the reverse gate signal bypass_r to control the second driving signal B2 to be input to the pixel array according to the enable signal enable.

[0046] In an embodiment, as shown in Figure 3As shown, the forward driving circuit X1 includes a first driving control unit 110 and a first driving unit 120, the forward gate signal bypass_1 and the enable signal enable are input into the first driving control unit 110, and the first driving control unit 110 is configured to control the first driving unit 120 to drive the pixel array based on the first driving signal B1 according to the forward gate signal bypass_1 and the enable signal enable; the reverse driving circuit X2 includes a second driving control unit 130 and a second driving unit 140, the reverse gate signal bypass_r and the enable signal enable are input into the second driving control unit 130, and the second driving control unit 130 is configured to control the second driving unit 140 to drive the pixel array based on the second driving signal B2 according to the reverse gate signal bypass_r and the enable signal enable.

[0047] In an embodiment, as shown, Figure 3 As shown, the first driving control unit 110 and the second driving control unit 130 each include a driving operation circuit 111, 131 and a switch circuit 112, 132, the driving operation circuit 111, 131 is configured to control the switch circuit 112, 132 to be on or off based on the enable signal enable and the forward gate signal bypass_1 or the reverse gate signal bypass_r, so as to control whether the first driving unit 120 and the second driving unit 140 are connected to the working voltage. In an embodiment, the driving operation circuit 111, 131 can be but is not limited to an OR gate circuit, for example, when the driving operation circuit 111 is an OR gate circuit, the driving operation circuit 111 is configured to output a high level only when the input enable signal enable is at a high level when the forward gate signal bypass_1 is at a low level, so as to control the switch circuit 112 to be on, thereby controlling the first driving unit 120 to be connected to the working voltage. In an embodiment, the driving operation circuit 111, 131 can be but is not limited to an AND gate circuit, for example, when the driving operation circuit 111 is an AND gate circuit, the driving operation circuit 111 is configured to output a high level only when the enable signal enable is at a high level when the forward gate signal bypass_1 is at a high level, so as to control the switch circuit 112 to be on, thereby controlling the first driving unit 120 to be connected to the working voltage. It can be understood that the switch circuit 112 can be but is not limited to an NMOS or the like to be on when receiving a high level, or can be a PMOS or the like to be on when receiving a low level, so that the above-mentioned driving operation circuit 111 can be an OR-NOT gate circuit, or can be an AND-NOT gate circuit.

[0048] Based on the same inventive concept, the present application also provides a driving method of an image sensor driving system for driving the image sensor driving system of the above-mentioned embodiments. Figure 5 The flow chart of the driving method of the image sensor driving system of an embodiment of the present application is shown inFigure 5 The driving method comprises:

[0049] S1, inputting a first time signal A to a delay control circuit, the first time signal A generates a driving signal B through a first delay unit M1, and the first delay unit M1 makes the output time of the first time signal A earlier than the output time of the driving signal B, the driving signal B generates a second time signal C through a second delay unit M2, and the second delay unit M2 makes the output time of the second time signal C later than the output time of the driving signal B, wherein the time difference between the output time of the first time signal A and the output time of the second time signal C is not shorter than the time difference between the first driving signal B1 and the second driving signal B2.

[0050] S2, inputting the first time signal A and the second time signal C to a delay operation module 220, and the delay operation module 220 performs logical operation on the first time signal A and the second time signal C to generate an enable signal enable.

[0051] S3, providing the enable signal enable to a bidirectional driving circuit X, and the enable signal enable controls the bidirectional driving circuit X to bidirectionally drive the pixel array based on the time difference between the first driving signal B1 and the second driving signal B2, so as to eliminate the signal competition relationship of the bidirectional driving.

[0052] Specifically, the first time signal A can be received by the delay control circuit to perform delay processing on the first time signal A. The first time signal A can be controlled by the first delay unit M1 to generate the driving signal B through delay, and the start time of the first time signal A is earlier than the driving signal B. The output end of the first delay unit M1 sends the driving signal B to the input end of the second delay unit M2. Then, the driving signal B can be controlled by the second delay unit M2 to generate the second time signal C through delay, and the start time of the second time signal C is later than the driving signal B. Thus, the enable signal enable can be generated by the delay operation module 220 according to the first time signal A and the second time signal C, and because the delay between the first time signal A and the driving signal B, and the delay between the driving signal B and the second time signal C can be controlled, the enable signal enable can be generated by the delay operation module 220 according to the first time signal A and the second time signal C, and the level time period of the enable signal enable, for example, the low level time period, includes the time period of the competition and risk of the first driving signal B1 and the second driving signal B2.

[0053] Finally, the enable signal enable is provided to a driving circuit, and based on the time difference between the first driving signal B1 and the second driving signal B2, the bidirectional driving circuit X is controlled to bidirectionally drive the pixel array to eliminate the competition and risk of the bidirectional driving signals. When the first driving signal B1 and the second driving signal B2 exist in competition and risk, the bidirectional driving circuit X is controlled not to output the first driving signal B1 and the second driving signal B2 according to the enable signal enable, and when the first driving signal B1 and the second driving signal B2 do not exist in competition and risk, the bidirectional driving circuit X is controlled to output the first driving signal B1 and the second driving signal B2 according to the enable signal enable. For example, the forward driving circuit X1 of the bidirectional driving circuit X stops outputting the first driving signal B1 according to the low level period of the enable signal enable, and the reverse driving circuit X2 of the bidirectional driving circuit X stops outputting the second driving signal B2 according to the low level period of the enable signal enable, so as to eliminate the competition and risk between the first driving signal B1 and the second driving signal B2. When the first driving signal B1 and the second driving signal B2 exist in competition and risk, the enable signal enable is high, the first driving signal B1 is input to the pixel array by the forward driving circuit X1, and the second driving signal B2 is input to the pixel array by the reverse driving circuit X2, so that the competition and risk of the signals will not occur.

[0054] The time difference between the first driving signal B1 and the second driving signal B2 is related to the direction of the driving signal B source and the length of the pixel array. If the driving signal B is transmitted from the middle of the pixel array to the left and right sides of the pixel array, the time difference between the first driving signal B1 and the second driving signal B2 is small. If the driving signal B is transmitted from the left or right side of the pixel array to the left and right sides of the pixel array, the time difference between the first driving signal B1 and the second driving signal B2 is large, and will change according to the length of the pixel array, that is, the longer the length of the pixel array, the larger the time difference between the first driving signal B1 and the second driving signal B2.

[0055] Therefore, the driving method of the image sensor driving system of the embodiment can control the output of the first driving signal B1 and the second driving signal B2 based on the time difference between the first driving signal B1 and the second driving signal B2 according to the enable signal enable, so as to eliminate the competition and risk of the bidirectional driving of the first driving signal B1 and the second driving signal B2, thereby achieving the effect of balancing the bidirectional driving capability.

[0056] In an embodiment, when the image sensor driving system is configured as bidirectional driving, the forward gate signal bypass_1 and the reverse gate signal bypass_r are turned on. For example, when both the forward gate signal bypass_1 and the reverse gate signal bypass_r are turned on, the forward driving circuit X1 of the bidirectional driving circuit X can be controlled to input the first driving signal B1 to the pixel array according to the enable signal enable, and the reverse driving circuit X2 of the bidirectional driving circuit X can be controlled to input the second driving signal B2 to the pixel array according to the enable signal enable.

[0057] In an embodiment, when the image sensor driving system is configured as unidirectional driving, the forward gate signal bypass_1 or the reverse gate signal bypass_r is turned on, wherein: when the forward gate signal bypass_1 is turned on, the first driving operation unit performs logical operation to control the output of the first driving signal B1 when the enable signal enable is input to the first driving operation unit; and when the reverse gate signal bypass_r is turned on, the second driving operation unit performs logical operation to control the output of the second driving signal B2 when the enable signal enable is input to the second driving operation unit.

[0058] In an embodiment, the first driving operation unit and the second driving operation unit can but are not limited to perform OR gate logical operation. For example, when the first driving operation unit performs OR gate logical operation through the driving operation circuit 111, the driving operation circuit 111 can be used to output high level only when the input enable signal enable is high level when the forward gate signal bypass_1 is low level, so as to control the switch circuit 112 to be turned on, thereby controlling the first driving unit 120 to access the working voltage and controlling the first driving unit 120 to output the first driving signal B1. In an embodiment, the first driving operation unit and the second driving operation unit can but are not limited to perform NOT gate logical operation. For example, when the driving operation circuit 111 performs NOT gate logical operation through the driving operation circuit 111, the driving operation circuit 111 can be used to output high level only when the enable signal enable is high level when the forward gate signal bypass_1 is high level, so as to control the switch circuit 112 to be turned on, thereby controlling the first driving unit 120 to access the working voltage and controlling the first driving unit 120 to output the first driving signal B1. It can be understood that the switch circuit 112 can but is not limited to be NMOS or the like to be turned on when high level is received, and can be PMOS or the like to be turned on when low level is received, so that the above-mentioned first driving operation unit and the second driving operation unit can perform OR NOT gate logical operation, or can perform AND NOT gate logical operation.

[0059] In an embodiment, the delay operation module 220 can, but not limited to, perform an XNOR logic operation on the first time signal A and the second time signal C for the purpose of time delay.

[0060] Based on the same inventive concept, the present application also provides an image sensor comprising the image sensor driving system of the above-mentioned embodiments. The implementation of the image sensor can refer to the above-mentioned embodiments of the image sensor driving system, and the repeated parts will not be described again.

[0061] The image sensor driving system, driving method and image sensor of the present application can control the output of the first driving signal B1 and the second driving signal B2 based on the time difference between the first driving signal B1 and the second driving signal B2 according to the enable signal enable, so as to eliminate the competition and risk when the first driving signal B1 and the second driving signal B2 are bidirectionally driven, thereby achieving the effect of balancing the bidirectional driving capability.

[0062] The above-mentioned embodiments are only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, there will be changes in the specific embodiments and application scope, and on the basis of the above, the content of the present application should not be understood as a limitation of the present application, and the protection scope of the present application should be subject to the appended claims.

Claims

1. An image sensor driving system, characterized in that, The image sensor driving system includes a bidirectional driving circuit and a signal generation circuit connected to the bidirectional driving circuit. The signal generation circuit generates a driving signal and an enable signal to control the bidirectional driving circuit to bidirectionally drive the pixel array of the image sensor, wherein: The bidirectional driving circuit includes a forward driving circuit and a reverse driving circuit arranged opposite to each other. The first input terminal of the forward driving circuit and the first input terminal of the reverse driving circuit jointly receive the enable signal, and the second input terminal of the forward driving circuit and the second input terminal of the reverse driving circuit jointly receive the driving signal. The forward driving circuit and the reverse driving circuit simultaneously drive the pixel array from both forward and reverse directions according to the enable signal and the driving signal. The driving signal received by the second input terminal of the forward driving circuit is input to the pixel array of the image sensor as the first driving signal, and the driving signal received by the second input terminal of the reverse driving circuit is input to the pixel array of the image sensor as the second driving signal. The output terminal of the signal generation circuit is connected to the first input terminal of the forward driving circuit and the first input terminal of the reverse driving circuit to provide the enable signal. The signal generation circuit generates the enable signal according to the time difference that exists when the first driving signal and the second driving signal bidirectionally drive the pixel array to eliminate the signal competition relationship of bidirectional driving. The signal generation circuit includes a delay control module and a delay calculation module, wherein the delay calculation module is used to generate an enable signal; The delay control module includes a first delay unit and a second delay unit. The input terminal of the first delay unit and the output terminal of the second delay unit are both connected to the delay calculation module. The input terminal of the first delay unit receives a first time signal, and the control terminal of the first delay unit receives a first delay control signal. The first delay unit generates the drive signal based on the first time signal and the first delay control signal, and sets the start time of the first time signal earlier than the drive signal. The input terminal of the second delay unit is connected to the output terminal of the first delay unit to receive the drive signal, and the control terminal of the second delay unit receives a second delay control signal. The second delay unit generates a second time signal based on the drive signal and the second delay control signal, and sets the start time of the second time signal later than the drive signal. The input terminal of the delay calculation module is connected to the input terminal of the first delay unit and the output terminal of the second delay unit to generate the enable signal based on the first time signal and the second time signal.

2. The image sensor driving system according to claim 1, characterized in that, The start time difference between the first time signal and the second time signal is not shorter than the time difference between the first drive signal and the second drive signal.

3. The image sensor driving system according to claim 1, characterized in that, The start time difference between the first drive signal and the second time signal is not shorter than the time difference between the first drive signal and the second drive signal.

4. The image sensor driving system according to claim 1, characterized in that, The delay operation module includes an XOR gate circuit. The first input terminal of the XOR gate circuit is connected to the first delay unit, the second input terminal of the XOR gate circuit is connected to the second delay unit, and the output terminal of the XOR gate circuit is connected to the first input terminal of the forward driving circuit and the first input terminal of the reverse driving circuit. The XOR gate circuit is used to perform an XOR operation on the first time signal and the second time signal to generate an enable signal and output it.

5. The image sensor driving system according to claim 1, characterized in that, The forward driving circuit and the reverse driving circuit each include a driving control unit and a driving unit; the driving unit is used to drive the pixel array, and the driving control unit is used to control the driving unit to drive the pixel array according to the enable signal.

6. The image sensor driving system according to claim 5, characterized in that, The third input terminal of the forward driving circuit is also connected to a forward gating signal, and the third input terminal of the reverse driving circuit is also connected to a reverse gating signal.

7. The image sensor driving system according to claim 6, characterized in that, The forward driving circuit includes a first driving control unit and a first driving unit. The forward gating signal and the enable signal are connected to the first driving control unit. The first driving control unit is used to control the first driving unit to drive the pixel array based on the first driving signal according to the forward gating signal and the enable signal. The reverse drive circuit includes a second drive control unit and a second drive unit. The reverse gating signal and the enable signal are connected to the second drive control unit. The second drive control unit is used to control the second drive unit to drive the pixel array based on the second drive signal according to the reverse gating signal and the enable signal.

8. The image sensor driving system according to claim 7, characterized in that, Both the first drive control unit and the second drive control unit include a drive operation circuit and a switching circuit. The drive operation circuit controls the switching circuit to open or close based on the enable signal and the positive or negative gating signal, thereby controlling whether the first drive unit and the second drive unit are connected to the working voltage.

9. A driving method for an image sensor driving system, used in the image sensor driving system according to any one of claims 1-8, characterized in that, The driving method includes the following steps: A first time signal is input to a delay control circuit. The first time signal is processed by a first delay unit to generate a drive signal. The first delay unit makes the output time of the first time signal earlier than the output time of the drive signal. The drive signal is processed by a second delay unit to generate a second time signal. The second delay unit makes the output time of the second time signal later than the output time of the drive signal. The output time difference between the first time signal and the second time signal is not less than the time difference between the first drive signal and the second drive signal. A first time signal and a second time signal are input to the delay operation module, and the delay operation module performs logical operations on the first time signal and the second time signal to generate an enable signal. The enable signal is provided to the bidirectional driving circuit. The enable signal controls the bidirectional driving circuit to drive the pixel array bidirectionally based on the time difference between the first driving signal and the second driving signal, so as to eliminate the signal competition relationship of bidirectional driving.

10. The driving method of the image sensor driving system according to claim 9, characterized in that, When the image sensor driving system is configured for bidirectional driving, the positive gating signal and the reverse gating signal are activated.

11. The driving method of the image sensor driving system according to claim 9, characterized in that, When the image sensor driving system is configured for unidirectional driving, either the positive gating signal or the reverse gating signal is activated, wherein: When the positive selection signal is turned on, and when the enable signal is input to the first driving operation unit, the first driving operation unit performs logical operations and controls the output of the first driving signal. When the reverse selection signal is turned on, and when the enable signal is input to the second drive arithmetic unit, the second drive arithmetic unit performs logical operations and controls the output of the second drive signal.

12. The driving method for the image sensor driving system according to claim 11, characterized in that, Both the first driving operation unit and the second driving operation unit perform OR gate logic operations.

13. The driving method for the image sensor driving system according to claim 11, characterized in that, Both the first driving operation unit and the second driving operation unit perform AND gate logic operations.

14. The driving method for the image sensor driving system according to claim 9, characterized in that, The delay operation module performs an XOR gate logic operation on the first time signal and the second time signal.

15. An image sensor, the image sensor comprising the image sensor driving system as described in any one of claims 1-8.

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