Memristive memory forgetting circuit associated with color temperature of learning tool screen

Abstract

The invention discloses a memristor memory forgetting circuit associated with the color temperature of a learning tool screen, and belongs to the technical field of circuit design. The method simulates the influence of the color temperature of a learning tool screen on learning memory on a mixed teaching line, realizes a memristor memory forgetting circuit in a mixed teaching scene by using a novel nano device, namely the memristor, and is very suitable for electronic synapse by using the advantages of non-volatility, variable resistance, threshold value characteristic and the like of the memristor. The circuit is simple in structure and complete in function, and a new thought is provided for application of the memristor in the new field.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit design, and relates to a memristor memory forgetting circuit associated with the screen color temperature of a learning tool. Background Art

[0002] With the development of Internet technology, various new educational and teaching models have begun to emerge, such as micro-courses, MOOCs and blended teaching. Among them, blended teaching is considered to be the main form of future teaching due to its flexibility, convenience and personalized learning experience. A key problem with online learning is that long-term use of electronic devices can cause eye fatigue and mental fatigue. Studies have shown that the screen settings of electronic devices are closely related to visual perception. For example, different screen color temperatures can cause different degrees of visual fatigue, which can affect learning status. Summary of the invention

[0003] In view of the above problems, the present invention proposes a memristor memory forgetting circuit associated with the screen color temperature of a learning tool, which specifically relates to a bionic circuit built with a memristor that complies with the biological memory forgetting rules. The specific technical solution is as follows:

[0004] A memristor memory forgetting circuit for the screen color temperature of an associative learning tool, the specific structure is as follows:

[0005] The first memristor M 1 The positive end of the fourth resistor R 4 One end of the first comparator com 1 The positive input terminal, M 1 The negative end of the fourth resistor R 4 The other end is connected to the first adder SUM 1 The output end of the second memristor M 2 The positive end of the sixth resistor R 6 One end of the second comparator com 2 The positive input terminal, M 2 The negative end of the sixth resistor R 6 The other end is connected to the second adder SUM 2 The output end of the third memristor M 3 The positive end of the eighth resistor R 8 One end and the third comparator com 3 The positive input terminal, M 3 The negative end of the eighth resistor R 8 The other end is connected to the third adder SUM 3 The output end of the fourth memristor M 4 The positive terminal of the fourth adder SUM 4 The output terminal and the first divider DIV 1 Input 1, M4 The negative terminal is connected to the eleventh resistor R 11 One end and the first divider DIV 1 Input 2 of the first divider DIV 1 The output terminal is connected to the memory change output terminal V memory .

[0006] The first voltage-controlled switch S 1 The two input terminals are connected to the voltage V 1 and ground, the control terminal is connected to the resource valid signal input terminal V online , the output terminal is connected to the first resistor R 1 One end of the third voltage-controlled switch S 3 , the fourth voltage-controlled switch S 4 and the fifth voltage-controlled switch S 5 One input terminal, the first resistor R 1 The other end of the ground; when V online When it is high, S 1 Output voltage V 1 , when V online When it is low, S 1 Output ground.

[0007] The second voltage-controlled switch S 2 The two input terminals are connected to the voltage V 2 and ground, the control terminal is connected to the learning state recovery signal input terminal V restore , the output end is connected to the second resistor R 2 One end, and the first adder SUM 1 , the second adder SUM 2 and the third adder SUM 3 Input terminal 2, the second resistor R 2 The other end of the ground; when V restore When it is high, S 2 Output voltage V 2 , when V restore When it is low, S 2 Output ground.

[0008] The third voltage-controlled switch S 3 The two input ends are respectively connected to the first voltage-controlled switch S 1 The output terminal and ground, the control terminal is connected to the learning tool screen low color temperature signal input terminal V L , the output end is connected to the third resistor R 3 One end and the first adder SUM 1 Input terminal 1, the third resistor R 3 The other end of the ground; when V L When it is high, S 3 The output is connected to the first voltage-controlled switch S1 The output, when V L When it is low, S 3 Output ground.

[0009] The fourth voltage-controlled switch S 4 The two input ends are respectively connected to the first voltage-controlled switch S 1 The output terminal and ground, the control terminal is connected to the learning tool screen medium color temperature signal input terminal V M , the output terminal is connected to the fifth resistor R 5 One end and the second adder SUM 2 Input terminal 1, the fifth resistor R 5 The other end of the ground; when V M When it is high, S 4 The output is connected to the first voltage-controlled switch S 1 The output, when V M When it is low, S 4 Output ground.

[0010] The fifth voltage-controlled switch S 5 The two input ends are respectively connected to the first voltage-controlled switch S 1 The output terminal and ground, the control terminal is connected to the high color temperature signal input terminal V of the learning tool screen H , the output terminal is connected to the seventh resistor R 7 One end and the third adder SUM 3 Input terminal 1, seventh resistor R 7 The other end of the ground; when V H When it is high, S 5 The output is connected to the first voltage-controlled switch S 1 The output, when V H When it is low, S 5 Output ground.

[0011] The sixth voltage-controlled switch S 6 The two input terminals are connected to the voltage V 9 and ground, the control terminal is connected to the first comparator COM 1 , the second comparator COM 2 and the third comparator com 3 The output terminal is connected to the actual learning signal output terminal V study 、The ninth resistor R 9 One end of the fourth adder SUM 4 The first PMOS transistor P 1 and the first NMOS transistor N 1 The gate, the ninth resistor R 9 The other end of the control terminal is grounded; when the control terminal input is high level, S 6 Output voltage V 9, when the control input is low level, S 6 Output ground.

[0012] The first comparator COM 1 The positive input terminal is connected to the first memristor M 1 The positive terminal of the negative input terminal is connected to the voltage V 3 When the positive input signal is higher than the negative input signal, the comparator output voltage V 4 , when the positive input signal is lower than the negative input signal, the output of the comparator is grounded.

[0013] The second comparator COM 2 The positive input terminal is connected to the second memristor M 2 The positive terminal of the negative input terminal is connected to the voltage V 5 When the positive input signal is higher than the negative input signal, the comparator output voltage V 6 , when the positive input signal is lower than the negative input signal, the output of the comparator is grounded.

[0014] The third comparator COM 3 The positive input terminal is connected to the third memristor M 3 The positive terminal of the negative input terminal is connected to the voltage V 7 When the positive input signal is higher than the negative input signal, the comparator output voltage V 8 , when the positive input signal is lower than the negative input signal, the output of the comparator is grounded.

[0015] The first PMOS transistor P 1 The source voltage V 10 , the drain is connected to the first NMOS transistor N 1 The drain and the seventh voltage-controlled switch S 7 The first NMOS transistor N 1 The source of the grounded, the drain of the first PMOS transistor P 1 The drain and the seventh voltage-controlled switch S 7 control terminal.

[0016] Seventh voltage-controlled switch S 7 The two input terminals are connected to the voltage V 11 and ground, the output end is connected to the tenth resistor R 10 One end and the fourth adder SUM 4 Input terminal 2, the tenth resistor R 10 The other end of the control terminal is grounded; when the control terminal input is high level, S 7 Output voltage V 11 , when the control terminal input is low level, S 7 Output ground. The eleventh resistor R 11The other end is grounded.

[0017] Beneficial effects of the present invention:

[0018] The present invention simulates the effect of the color temperature of the learning tool screen on online learning memory in hybrid teaching, and uses a new nano device, the memristor, to realize a memristor memory forgetting circuit in a hybrid teaching scenario. The memristor has the advantages of non-volatility, variable resistance and threshold characteristics, and is very suitable for use in electronic synapses. The circuit structure of the present invention is simple and the function is complete, which provides a new idea for the application of memristors in new fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation modes of the present invention or the technical solutions in the prior art, the accompanying drawings required for describing the examples of the present invention are briefly introduced below.

[0020] Figure 1 A schematic diagram of a device of a memristor used in the present invention;

[0021] Figure 2 A memristor memory forgetting circuit diagram of a screen color temperature associative learning tool of the present invention;

[0022] Figure 3 This is a simulation result diagram of the memristor memory forgetting circuit of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings. A memristor memory forgetting circuit associated with the screen color temperature of a learning tool comprises: a first memristor M 1 , the second memristor M 2 , the third memristor M 3 , the fourth memristor M 4 ; The first voltage-controlled switch S 1 , the second voltage-controlled switch S 2 , the third voltage-controlled switch S 3 , the fourth voltage-controlled switch S 4 , the fifth voltage-controlled switch S 5 , the sixth voltage-controlled switch S 6 , the seventh voltage-controlled switch S 7 ; The first resistor R 1 , the second resistor R 2 , the third resistor R 3 , the fourth resistor R 4 , the fifth resistor R 5 , the sixth resistor R 6 , the seventh resistor R 7 , the eighth resistor R 8 、The ninth resistor R 9 , the tenth resistor R 10 11th resistor R11 ; First comparator COM 1 , the second comparator COM 2 、The third comparator COM 3 ; First adder SUM 1 , the second adder SUM 2 , the third adder SUM 3 , the fourth adder SUM 4 ; The first PMOS transistor P 1 , the first NMOS transistor N 1 ; The first divider DIV 1 ; The first constant voltage V 1 , the second constant voltage V 2 , the third fixed voltage V 4 , the fourth constant voltage V 6 , the fifth fixed voltage V 8 , the sixth constant voltage V 9 , the seventh fixed voltage V 10 , the eighth fixed voltage V 11 ; The first comparison voltage V 3 , the second comparison voltage V 5 , the third comparison voltage V 7 ;Learning tool screen high, medium and low color temperature signal input terminal V H 、V M and V L , Online resource valid signal input terminal V online , the actual learning signal output terminal V study , learning state recovery signal input terminal V restore 、Memory change output terminal V memory .

[0024] The first memristor M 1 The positive end of the fourth resistor R 4 One end of the first comparator com 1 The positive input terminal, M 1 The negative terminal of the second memristor M 2 The positive end of the sixth resistor R 6 One end of the second comparator com 2 The positive input terminal, M 2 The negative terminal of the third memristor M 3 The positive end of the eighth resistor R 8 One end and the third comparator com 3 The positive input terminal, M 3 The negative terminal of the fourth memristor M 4 The positive terminal of the fourth adder SUM 4The output terminal and the first divider DIV 1 Input 1, M 4 The negative terminal is connected to the eleventh resistor R 11 One end and the first divider DIV 1 Input 2 of the first divider DIV 1 The output terminal is connected to the memory change output terminal V memory .

[0025] The first voltage-controlled switch S 1 The two input terminals are connected to the voltage V 1 and ground, the control terminal is connected to the resource valid signal input terminal V online , the output terminal is connected to the first resistor R 1 One end of the third voltage-controlled switch S 3 , the fourth voltage-controlled switch S 4 and the fifth voltage-controlled switch S 5 One input terminal, the first resistor R 1 The other end of the ground; when V online When it is high, S 1 Output voltage V 1 , when V online When it is low, S 1 Output ground.

[0026] The second voltage-controlled switch S 2 The two input terminals are connected to the voltage V 2 and ground, the control terminal is connected to the learning state recovery signal input terminal V restore , the output end is connected to the second resistor R 2 One end, and the first adder SUM 1 , the second adder SUM 2 and the third adder SUM 3 Input terminal 2, the second resistor R 2 The other end of the ground; when V restore When it is high, S 2 Output voltage V 2 , when V restore When it is low, S 2 Output ground.

[0027] The third voltage-controlled switch S 3 The two input ends are respectively connected to the first voltage-controlled switch S 1 The output terminal and ground, the control terminal is connected to the learning tool screen low color temperature signal input terminal V L , the output end is connected to the third resistor R 3 One end and the first adder SUM 1 Input terminal 1, the third resistor R 3 The other end of the ground; when VL When it is high, S 3 The output is connected to the first voltage-controlled switch S 1 The output, when V L When it is low, S 3 Output ground.

[0028] The fourth voltage-controlled switch S 4 The two input ends are respectively connected to the first voltage-controlled switch S 1 The output terminal and ground, the control terminal is connected to the learning tool screen medium color temperature signal input terminal V M , the output terminal is connected to the fifth resistor R 5 One end and the second adder SUM 2 Input terminal 1, the fifth resistor R 5 The other end of the ground; when V M When it is high, S 4 The output is connected to the first voltage-controlled switch S 1 The output, when V M When it is low, S 4 Output ground.

[0029] The fifth voltage-controlled switch S 5 The two input ends are respectively connected to the first voltage-controlled switch S 1 The output terminal and ground, the control terminal is connected to the high color temperature signal input terminal V of the learning tool screen H , the output terminal is connected to the seventh resistor R 7 One end and the third adder SUM 3 Input terminal 1, seventh resistor R 7 The other end of the ground; when V H When it is high, S 5 The output is connected to the first voltage-controlled switch S 1 The output, when V H When it is low, S 5 Output ground.

[0030] The sixth voltage-controlled switch S 6 The two input terminals are connected to the voltage V 9 and ground, the control terminal is connected to the first comparator COM 1 , the second comparator COM 2 and the third comparator com 3 The output terminal is connected to the actual learning signal output terminal V study 、The ninth resistor R 9 One end of the fourth adder SUM 4 The first PMOS transistor P 1 and the first NMOS transistor N 1 The gate, the ninth resistor R 9The other end of the control terminal is grounded; when the control terminal input is high level, S 6 Output voltage V 9 , when the control input is low level, S 6 Output ground.

[0031] The fourth resistor R 4 One end is connected to the first adder SUM 1 The other end is connected to the output end of the first memristor M 1 The positive end of the sixth resistor R 6 One end is connected to the second adder SUM 2 The other end is connected to the output end of the second memristor M 2 The positive end of the eighth resistor R 8 One end is connected to the third adder SUM 3 The other end is connected to the output end of the third memristor M 3 The positive end.

[0032] The first comparator com 1 The positive input terminal is connected to the first memristor M 1 The positive terminal of the negative input terminal is connected to the voltage V 3 The output terminal is connected to the sixth voltage-controlled switch S 6 The control terminal of the second comparator COM 2 and the third comparator com 3 When the positive input signal is higher than the negative input signal, the comparator output voltage V 4 , when the positive input signal is lower than the negative input signal, the output of the comparator is grounded.

[0033] The second comparator com 2 The positive input terminal is connected to the second memristor M 2 The positive terminal of the negative input terminal is connected to the voltage V 5 , the output end is connected to the sixth voltage-controlled switch S 6 The control terminal of the first comparator COM 1 and the third comparator com 3 When the positive input signal is higher than the negative input signal, the comparator output voltage V 6 , when the positive input signal is lower than the negative input signal, the output of the comparator is grounded.

[0034] The third comparator com 3 The positive input terminal is connected to the third memristor M 3 The positive terminal of the negative input terminal is connected to the voltage V 7 , the output end is connected to the sixth voltage-controlled switch S 6 The control terminal of the first comparator COM 1 and the second comparator com2 When the positive input signal is higher than the negative input signal, the comparator output voltage V 8 , when the positive input signal is lower than the negative input signal, the output of the comparator is grounded.

[0035] The first PMOS transistor P 1 The gate of the first NMOS transistor N 1 The gate, the ninth resistor R 9 One end of the sixth voltage-controlled switch S 6 The output terminal of the actual learning signal output terminal V study and the fourth adder SUM 4 Input terminal 1, source connected to voltage V 10 , the drain is connected to the first NMOS transistor N 1 The drain and the seventh voltage-controlled switch S 7 The first NMOS transistor N 1 The gate of the first PMOS transistor P 1 The gate, the ninth resistor R 9 , the sixth voltage-controlled switch S 6 The output terminal of the actual learning signal output terminal V study and the fourth adder SUM 4 The source is grounded and the drain is connected to the first PMOS transistor P 1 The drain and the seventh voltage-controlled switch S 7 control terminal.

[0036] The seventh voltage-controlled switch S 7 The two input terminals are connected to the voltage V 11 and ground, the control terminal is connected to the first PMOS transistor P 1 and the first NMOS transistor N 1 The output terminal is connected to the tenth resistor R 10 One end and the fourth adder SUM 4 Input terminal 2, the tenth resistor R 10 The other end of the control terminal is grounded; when the control terminal input is high level, S 7 Output voltage V 11 , when the control terminal input is low level, S 7 Output ground.

[0037] The first divider DIV 1 The input terminal 1 of the fourth adder SUM 4 The output terminal and the fourth memristor M 4 The positive terminal of the 2nd input terminal is connected to the fourth memristor M 4 The negative terminal and the eleventh resistor R 11One end of the eleventh resistor R 11 The other end is grounded, and the output end is connected to the memory change output end V memory .

[0038] Figure 1 This is a schematic diagram of the device model of the memristor used. The memristor is a two-terminal device whose resistance is affected by the voltage applied to both ends. As the voltage changes, the resistance of the memristor will also change. Its maximum memristor value is R H , the minimum memristor value is R L .

[0039] Figure 2 This is a schematic diagram of a memristor memory forgetting circuit of the screen color temperature of an associative learning tool built with the memristor used as the core. The circuit includes four memristors, seven voltage-controlled switches, four adders, three comparators, eleven resistors, a divider, a PMOS transistor, an NMOS transistor, eight fixed voltage ports, three comparison voltage ports, five signal input ports and two signal output ports. Figure 3 The simulation result of the memristor memory forgetting circuit is obtained by taking the screen color temperature of the learning tool as high color temperature as an example.

[0040] Input terminal V online The online resource valid signal, input high level indicates that the online learning resource is in the valid period, input low level indicates that the online learning resource is not in the valid period; input terminal V restore Indicates the learning state recovery signal. A high input level indicates that the state has been restored, and a low input level indicates that the state has not been restored. The input terminal V H 、V M and V L The input high level indicates the high, medium and low states of the current learning tool screen color temperature; the output V study Represents the learning signal. A high level output indicates that learning is in progress, and a low level output indicates that learning is not in progress. Output terminal V memory Indicates output memory changes.

[0041] The present invention conducts an example analysis on the influence of the color temperature of the learning tool screen on learning and memory, including three color temperature conditions of high, medium and low, each of which includes a learning stage and a forgetting stage.

[0042] Taking the case where the screen color temperature of the learning tool is high as an example, the working process is as follows:

[0043] Learning stage: The color temperature of the learning tool screen is high color temperature, that is, the input terminal V H For high voltage, V L and V M is 0, and the online resource valid signal V onlineis high level, restoring signal V restore is 0. Assume that the third memristor M 3 and the fourth memristor M 4 The initial resistance value is R H .

[0044] The first voltage-controlled switch S 1 and the fifth voltage-controlled switch S 5 Close, the first voltage-controlled switch S 1 Output high voltage V 1 , the fifth voltage-controlled switch S 5 Output high voltage V 1 , the third adder SUM 3 The output is V 1 , then add to the third memristor M 3 The voltage across the two ends is a positive voltage, and the third memristor M 3 The resistance value R M3 From its initial value R H The third memristor M 3 Positive terminal voltage V M3 for V M3 With R M3 The state of R M3 The value corresponds to the level of learning state. M3 The learning state gradually decreases, V M3 Also gradually decreased.

[0045] When V M3 Less than voltage V 7 When the third comparator com 3 The output is 0, the sixth voltage-controlled switch S 6 The output is 0, the output terminal V study is 0; when V M3 Greater than voltage V 7 When the third comparator com 3 Output high voltage, the sixth voltage-controlled switch S 6 Output high voltage, output terminal V study A high level indicates that the device has entered the learning state.

[0046] V study With the fourth adder SUM 4 The first PMOS transistor P 1 and the first NMOS transistor N 1 The gate of the first PMOS transistor P 1 The first NMOS transistor N 1 The seventh voltage-controlled switch S is turned on. 7 The output is 0. The fourth adder SUM4 The output is V study , and added to the fourth memristor M 4 The positive terminal makes the fourth memristor M 4 The resistance value R M4 From R H Start to descend until reaching R L No longer changes. The first divider DIV 1 The output of the fourth memristor M 4 The negative terminal voltage is divided by the positive terminal voltage. Assuming that the fourth memristor M 4 The positive terminal voltage is V M4 , then the output V memory for With R M4 The change of output terminal V memory The voltage value gradually rises, reaches a peak and then remains there for a while until the forgetting stage begins.

[0047] Forgetting stage: Output V study is 0, and enters the forgetting stage. When the color temperature of the learning tool screen is high, that is, the input terminal V H For high voltage, V L and V M is 0, and the online resource valid signal V online is high level, restoring signal V restore When R M3 The decrease of V M3 Then it decreases, when V M3 Less than voltage V 7 When the third comparator com 3 The output is 0, the sixth voltage-controlled switch S 6 The output is 0, the output terminal V study is 0. At this time, the third memristor M 3 and the fourth memristor M 4 The resistance value is R L .

[0048] V study With the fourth adder SUM 4 The first PMOS transistor P 1 and the first NMOS transistor N 1 The gate of the first PMOS transistor P 1 The first NMOS transistor N 1 Cut off, the seventh voltage-controlled switch S 7 Output negative voltage V 11 The fourth adder SUM 4 Output negative voltage V 11 , and added to the fourth memristor M 4The positive terminal makes the fourth memristor M 4 The resistance value R M4 From R L starts to rise. At this time, the first divider DIV 1 The output of the fourth memristor M 4 The negative terminal voltage is divided by the positive terminal voltage. Assuming that the fourth memristor M 4 The positive terminal voltage is V M4 , then the output V memory for With R M4 The change of output terminal V memory The curve starts to decline.

[0049] Then the color temperature of the learning tool screen is high color temperature, and the input terminal V H For high voltage, V L and V M 0, online resource valid signal V online Change to 0, restore signal V restore At this time, the third memristor M 3 The resistance value is R L , the fourth memristor M 4 The resistance value of R H and R L between.

[0050] The second voltage-controlled switch S 2 and the fifth voltage-controlled switch S 5 Close, the second voltage-controlled switch S 2 Output negative voltage V 2 The first voltage-controlled switch S 1 The output is 0, the fifth voltage-controlled switch S 5 The output is 0. The third adder SUM 3 The output is V 2 , then add to the third memristor M 3 The voltage across the two ends is negative, and the third memristor M 3 The resistance value R M3 From R L The third memristor M 3 Positive terminal voltage V M3 for V M3 With R M3 The state of R M3 The value corresponds to the level of learning state. M3 The learning state gradually recovers.

[0051] Since the voltage V 2 is a negative voltage, so V M3 Less than the positive voltage V 7 , the third comparator com3 The output is 0, the sixth voltage-controlled switch S 6 The output is 0, the output terminal V study When it is 0, it means the forgetting state is maintained.

[0052] V study With the fourth adder SUM 4 The first PMOS transistor P 1 and the first NMOS transistor N 1 The gate of the first PMOS transistor P 1 The first NMOS transistor N 1 Cut off, the seventh voltage-controlled switch S 7 Output negative voltage V 11 The fourth adder SUM 4 Output negative voltage V 11 , and added to the fourth memristor M 4 The positive terminal makes the fourth memristor M 4 The resistance value continues to rise until it reaches R H No longer changes. At this time, the first divider DIV 1 The output of the fourth memristor M 4 The negative terminal voltage is divided by the positive terminal voltage. Assuming that the fourth memristor M 4 The positive terminal voltage is V M4 , then the output V memory for With R M4 The change of output terminal V memory The curve continues to drop until it reaches a minimum point where it remains unchanged.

[0053] The simulation results of learning working screen with high color temperature are as follows Figure 3 When the color temperature is low and medium, the working process is similar. When the color temperature of the learning tool screen is low, the learning state decreases fastest, the learning time is shortest, and V study The high level time is the shortest, and the memory is maintained for a short time; when the color temperature of the learning tool screen is medium and high, the learning state decreases slowly, the learning time is longer, and V study The longer the high level time is, the longer the memory is maintained. This verifies the influence of color temperature on learning state and learning memory.

Claims

1. A memristor memory forgetting circuit for associating a learning tool screen color temperature, characterized in that: In the memristor memory forgetting circuit, the positive end of the first memristor M1 is connected to one end of the fourth resistor R4 and the positive input end of the first comparator COM1, the negative end of M1 is connected to the ground, and the other end of the fourth resistor R4 is connected to the output end of the first adder SUM1; the positive end of the second memristor M2 is connected to one end of the sixth resistor R6 and the positive input end of the second comparator COM2, the negative end of M2 is connected to the ground, and the other end of the sixth resistor R6 is connected to the output end of the second adder SUM2; the positive end of the third memristor M3 is connected to one end of the eighth resistor R8 and the positive input end of the third comparator COM3, the negative end of M3 is connected to the ground, and the other end of the eighth resistor R8 is connected to the output end of the third adder SUM3; the positive end of the fourth memristor M4 is connected to the output end of the fourth adder SUM4 and the input end No. 1 of the first divider DIV1, and the negative end of M4 is connected to the eleventh resistor R 11 One end of the first divider DIV1 and the No. 2 input end, the output end of the first divider DIV1 is connected to the memory change output end V memory .

2. The memristor memory forgetting circuit of the screen color temperature of the association learning tool according to claim 1 is characterized in that: The two input terminals of the first voltage-controlled switch S1 are connected to the voltage V1 and the ground respectively, and the control terminal is connected to the resource valid signal input terminal V online , the output end is connected to one end of the first resistor R1, and one input end of the third voltage-controlled switch S3, the fourth voltage-controlled switch S4 and the fifth voltage-controlled switch S5, and the other end of the first resistor R1 is grounded; The two input terminals of the second voltage-controlled switch S2 are connected to the voltage V2 and the ground respectively, and the control terminal is connected to the learning state recovery signal input terminal V restore , the output end is connected to one end of the second resistor R2, and the No. 2 input end of the first adder SUM1, the second adder SUM2 and the third adder SUM3, and the other end of the second resistor R2 is grounded; The two input terminals of the third voltage-controlled switch S3 are respectively connected to the output terminal of the first voltage-controlled switch S1 and the ground, and the control terminal is connected to the low color temperature signal input terminal V of the learning tool screen. L , the output end is connected to one end of the third resistor R3 and the input end 1 of the first adder SUM1, and the other end of the third resistor R3 is grounded; The two input terminals of the fourth voltage-controlled switch S4 are respectively connected to the output terminal of the first voltage-controlled switch S1 and the ground, and the control terminal is connected to the medium color temperature signal input terminal V M , the output end is connected to one end of the fifth resistor R5 and the input end 1 of the second adder SUM2, and the other end of the fifth resistor R5 is grounded; The two input terminals of the fifth voltage-controlled switch S5 are respectively connected to the output terminal of the first voltage-controlled switch S1 and the ground, and the control terminal is connected to the high color temperature signal input terminal V H , the output end is connected to one end of the seventh resistor R7 and the input end 1 of the third adder SUM3, and the other end of the seventh resistor R7 is grounded; The two input terminals of the sixth voltage-controlled switch S6 are connected to the voltage V9 and the ground respectively, the control terminal is connected to the output terminals of the first comparator COM1, the second comparator COM2 and the third comparator COM3, and the output terminal is connected to the actual learning signal output terminal V study , one end of a ninth resistor R9, input terminal 1 of a fourth adder SUM4, gates of the first PMOS transistor P1 and the first NMOS transistor N1, and the other end of the ninth resistor R9 is grounded.

3. The memristor memory forgetting circuit of the screen color temperature of the associated learning tool according to claim 2, characterized in that: The positive input terminal of the first comparator COM1 is connected to the positive terminal of the first memristor M1, and the negative input terminal is connected to the voltage V3; the positive input terminal of the second comparator COM2 is connected to the positive terminal of the second memristor M2, and the negative input terminal is connected to the voltage V5; the positive input terminal of the third comparator COM3 is connected to the positive terminal of the third memristor M3, and the negative input terminal is connected to the voltage V7; The source of the first PMOS transistor P1 is connected to a voltage V 10 The drain is connected to the drain of the first NMOS transistor N1 and the control end of the seventh voltage-controlled switch S7; the source of the first NMOS transistor N1 is grounded; the two input ends of the seventh voltage-controlled switch S7 are respectively connected to the voltage V 11 and ground, the output end is connected to the tenth resistor R 10 and the 2nd input terminal of the fourth adder SUM4, the tenth resistor R 10 The other end of the eleventh resistor R 11 The other end is grounded.

4. The memristor memory forgetting circuit of the screen color temperature of the association learning tool according to claim 3 is characterized in that: When the online resource valid signal input terminal V online When it is high level, S1 output is connected to voltage V1. online When it is low level, S1 output is grounded; When the learning state is restored, the signal input terminal V restore When it is high level, S2 output is connected to voltage V2. restore When it is low level, the output of S2 is grounded; When V L When it is high level, the output of S3 is connected to the output of the first voltage-controlled switch S1. L When it is low level, S3 output is grounded; When V M When it is high level, the output of S4 is connected to the output of the first voltage-controlled switch S1. M When it is low level, S4 output is grounded; When V H When it is high level, the output of S5 is connected to the output of the first voltage-controlled switch S1. H When low, the S5 output is grounded.

5. The memristor memory forgetting circuit of the screen color temperature of the associated learning tool according to claim 4, characterized in that: When the control terminal input of the sixth voltage-controlled switch S6 is at a high level, the output of S6 is connected to the voltage V9, and when the control terminal input is at a low level, the output of S6 is connected to the ground; When the positive input terminal signal of the first comparator COM1 is higher than the negative input terminal signal, the output voltage of the comparator is V4, and when the positive input terminal signal is lower than the negative input terminal signal, the output of the comparator is grounded; When the positive input terminal signal of the second comparator COM2 is higher than the negative input terminal signal, the output voltage of the comparator is V6, and when the positive input terminal signal is lower than the negative input terminal signal, the output of the comparator is grounded; When the positive input terminal signal of the third comparator COM3 is higher than the negative input terminal signal, the output voltage of the comparator is V8, and when the positive input terminal signal is lower than the negative input terminal signal, the output of the comparator is grounded; When the control terminal input of the seventh voltage-controlled switch S7 is at a high level, the output of S7 is connected to the voltage V 11 When the control terminal inputs a low level, the S7 output is grounded.

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