Multifunctional handwriting board control circuit

Abstract

The utility model relates to the technical field of handwriting boards, and particularly discloses a multifunctional handwriting board control circuit, which comprises a strong light-to-electric energy input charging circuit, a main control chip circuit, a screen cleaning key multiplexing circuit, a screen cleaning booster circuit and an overturning screen cleaning discharging circuit, and the strong light-to-electric energy input charging circuit, the screen cleaning key multiplexing circuit, the screen cleaning booster circuit and the turnover screen cleaning discharging circuit are electrically connected with the main control chip circuit. The hard light-to-electric energy input charging circuit is connected with the light energy circuit board for charging without a conventional adapter, the main control chip circuit is arranged to send a screen cleaning signal to the screen cleaning booster circuit at regular time, and the screen cleaning booster circuit controls the turnover screen cleaning discharging circuit to apply voltage to an electrode layer of a liquid crystal screen, so that the liquid crystal screen can be cleaned. Therefore, the arrangement direction of the liquid crystal molecules is controlled, contents on a screen are cleared, the liquid crystal molecules are activated and overturned regularly, and the stability of the liquid crystal molecules can be better protected.

Description

TECHNICAL FIELD

[0001] The utility model relates to a handwriting board technical field, especially a multifunctional handwriting board control circuit. BACKGROUND

[0002] A handwriting board is an electronic device for realizing writing and drawing. In order to be able to erase the writing traces displayed by the liquid crystal handwriting board, a transistor sensitive to target light is needed to be arranged in the liquid crystal handwriting board. When an erasing tool (for example, an eraser capable of emitting target light with high light intensity) is used to erase the writing traces displayed by the liquid crystal handwriting board, the transistor can be turned on under the irradiation of the target light, so that a voltage difference can be formed between the pixel electrode connected with the transistor and the common electrode in the liquid crystal handwriting board, so as to erase the writing traces in the irradiation area of the target light.

[0003] Generally, the liquid crystal handwriting board can include a first substrate and a second substrate arranged oppositely, and a liquid crystal layer between the first substrate and the second substrate. When the liquid crystal molecules in the liquid crystal layer are subjected to external pressure, the liquid crystal molecules can be converted from focal conic texture to planar texture. In this way, the liquid crystal molecules converted to planar texture can reflect light of a certain wavelength (for example, green light) in the incident ambient light, so that the liquid crystal handwriting board can display green writing traces. At present, in order to enrich the color types displayed by the liquid crystal handwriting board, liquid crystal molecules reflecting different colors are usually filled in different areas of the liquid crystal handwriting board, so that different areas of the liquid crystal handwriting board display different colors.

[0004] The existing liquid crystal handwriting board is charged by a conventional adapter and cannot be charged by strong light. In addition, it does not have a timing screen clearing function, so it cannot activate and flip the liquid crystal molecules regularly, resulting in low stability of the liquid crystal molecules. UTILITY MODEL CONTENT

[0005] The technical problem to be solved by the utility model is to provide a multifunctional handwriting board control circuit to solve the problem that the existing liquid crystal handwriting board cannot be charged by strong light, does not have a timing screen clearing function, cannot activate and flip the liquid crystal molecules regularly, and results in low stability of the liquid crystal molecules.

[0006] In order to solve the above technical problems, the technical scheme of the utility model is:

[0007] The utility model provides a multifunctional handwriting board control circuit, including strong light turns into electric energy input charging circuit, main control chip circuit, screen clearing button multiplexing circuit, screen clearing voltage increasing circuit and overturn screen clearing discharge circuit, strong light turns into electric energy input charging circuit, screen clearing button multiplexing circuit, screen clearing voltage increasing circuit and overturn screen clearing discharge circuit all are connected with main control chip circuit electrically, strong light turns into electric energy input charging circuit charges through the connection light energy circuit board, main control chip circuit sends screen clearing signal to screen clearing voltage increasing circuit regularly, and the electrode layer of liquid crystal screen is applied voltage to overturn screen clearing discharge circuit controlled by screen clearing voltage increasing circuit, thereby control liquid crystal molecule's arrangement direction.

[0008] Preferably, the main control chip circuit comprises a main control chip U1 and a capacitor C1, and the capacitor C1 is connected with the main control chip U1.

[0009] Preferably, the strong light turns into electric energy input charging circuit comprises a strong light charging interface P1, a charging management chip U2, an inductor L2, a diode D2, a resistor R8, a resistor R15 and a battery BT1, the strong light charging interface P1, the inductor L2, the diode D2 and the resistor R8 are connected with the charging management chip U2, the resistor R15 is connected with the resistor R8 and the battery BT1 respectively, and the battery BT1 is connected with the main control chip U1.

[0010] Preferably, the screen clearing button multiplexing circuit comprises a resistor R14, a button S1 and a button S2, the resistor R14 is connected with the button S2 and the battery BT1 respectively, and the button S1 and the button S2 are connected with the main control chip U1.

[0011] Preferably, the screen clearing voltage increasing circuit comprises an inductor L1, a triode Q1, a diode D1, a resistor R2, a capacitor C2, a capacitor C3 and a capacitor C4, the triode Q1 is connected with the inductor L1, the diode D1, the resistor R2 and the capacitor C2 respectively, the capacitor C3 and the capacitor C4 are connected with the diode D1, the inductor L1 is connected with a first pin of the main control chip U1, and the resistor R2 is connected with a fifth pin of the main control chip U1.

[0012] Preferably, the flip screen discharge circuit comprises a transistor Q2, a transistor Q3, a transistor Q4, a transistor Q5, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a liquid crystal screen interface P2, the resistor R6 and the resistor R7 are connected with the seventh pin and the sixth pin of the main control chip U1 respectively, the transistor Q3 is connected with the resistor R5, the transistor Q2, the transistor Q5 and the resistor R3 respectively, the transistor Q2 is connected with the resistor R4, the transistor Q4 and the resistor R3 respectively, the transistor Q4 and the transistor Q5 are connected with the resistor R6 and the resistor R7 respectively, the resistor R3 is connected with the liquid crystal screen interface P2, and the liquid crystal screen interface P2 is connected with a liquid crystal screen.

[0013] Preferably, the multifunctional handwriting board control circuit further comprises an indicator lamp control circuit, and the indicator lamp control circuit comprises a resistor R1, a resistor R13, a light emitting diode LR and a light emitting diode LG, the resistor R1 is connected with the third pin of the main control chip U1 and the light emitting diode LR respectively, and the resistor R13 is connected with the second pin of the main control chip U1 and the light emitting diode LG respectively.

[0014] Preferably, the multifunctional handwriting board control circuit further comprises a lithium battery protection circuit, and the lithium battery protection circuit comprises a lithium battery protection chip U4, a resistor R9 and a capacitor C6, the resistor R9 and the capacitor C6 are connected with the lithium battery protection chip U4, and the resistor R9 is connected with the battery BT1.

[0015] By adopting the technical scheme, the multifunctional handwriting board control circuit has the following beneficial effects: the strong light to electric energy input charging circuit, the screen cleaning button multiplexing circuit, the screen cleaning boost circuit and the flip screen discharge circuit in the multifunctional handwriting board control circuit are electrically connected with the main control chip circuit, the strong light to electric energy input charging circuit charges through the connection of the light energy circuit board, realizes strong light charging, and does not need a conventional adapter to charge; the main control chip circuit sends a screen cleaning signal to the screen cleaning boost circuit at regular time, the screen cleaning boost circuit controls the flip screen discharge circuit to apply voltage to the electrode layer of the liquid crystal screen, thereby controlling the arrangement direction of liquid crystal molecules, making the liquid crystal molecules return to the initial state, and thereby realizing the display and cleaning functions, and diversifying the functions. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The circuit principle drawing of the utility model. DETAILED DESCRIPTION

[0017] The specific embodiments of the present application will be further described in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present application, but does not constitute a limitation on the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0018] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0019] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0020] As Figure 1 As shown, the multifunctional handwriting board control circuit includes a strong light to electric energy input charging circuit, a main control chip circuit, a screen clearing button multiplexing circuit, a screen clearing boost circuit and a flip screen clearing discharge circuit. The strong light to electric energy input charging circuit, the screen clearing button multiplexing circuit, the screen clearing boost circuit and the flip screen clearing discharge circuit are electrically connected with the main control chip circuit. It can be understood that the strong light to electric energy input charging circuit charges through the connection of the light energy circuit board, without the need for a conventional adapter for charging. The main control chip circuit is arranged to send a screen clearing signal to the screen clearing boost circuit at regular intervals, and the screen clearing boost circuit controls the flip screen clearing discharge circuit to apply voltage to the electrode layer of the liquid crystal screen, thereby controlling the arrangement direction of the liquid crystal molecules, clearing the content on the screen, and realizing the activation and flip of the liquid crystal molecules at regular intervals, which can better protect the stability of the liquid crystal molecules.

[0021] Specifically, the master chip circuit includes a master chip U1 and a capacitor C1 connected with the master chip U1; the strong light to electric energy input charging circuit includes a strong light charging interface P1, a charging management chip U2, an inductor L2, a diode D2, a resistor R8, a resistor R15 and a battery BT1, the strong light charging interface P1, the inductor L2, the diode D2 and the resistor R8 are all connected with the charging management chip U2, the resistor R15 is connected with the resistor R8 and the battery BT1 respectively, and the battery BT1 is connected with the master chip U1. It can be understood that the master chip U1 can be a general single-chip microcomputer chip, which is equivalent to the "brain" of the liquid crystal writing board and is responsible for the operation control and signal processing of the whole device, and is internally integrated with a timer module for accurate timing; the charging management chip U2 can be a SOP23-6 chip, the strong light charging interface P1 is connected with a light energy battery panel to realize light energy charging, the light energy battery panel is composed of a plurality of photovoltaic cells, the photovoltaic cell is a kind of semiconductor device, when light irradiates on the photovoltaic cell, photons will transfer energy to the electrons in the cell, so that the electrons obtain enough energy to escape from the atom, thereby forming a potential difference in the cell. If the battery panel is connected with the external circuit at this time, the electrons will flow in the circuit under the action of the potential difference, forming a current, so as to charge the storage battery and other devices connected in the circuit. The strong light to electric energy input charging circuit is used to provide stable power supply for each component of the liquid crystal writing board, and in the timing screen clearing function, sufficient energy is needed to provide for the screen clearing operation at a specific time.

[0022] Specifically, the screen clearing button multiplexing circuit comprises a resistor R14, a button S1 and a button S2, the resistor R14 is connected with the button S2 and a battery BT1 respectively, and the button S1 and the button S2 are connected with the main control chip U1; the screen clearing voltage boosting circuit comprises an inductor L1, a triode Q1, a diode D1, a resistor R2, a capacitor C2, a capacitor C3 and a capacitor C4, the triode Q1 is connected with the inductor L1, the diode D1, the resistor R2 and the capacitor C2 respectively, the capacitor C3 and the capacitor C4 are connected with the diode D1, the inductor L1 is connected with a first pin of the main control chip U1, and the resistor R2 is connected with a fifth pin of the main control chip U1; the flip screen clearing discharging circuit comprises a triode Q2, a triode Q3, a triode Q4, a triode Q5, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a liquid crystal screen interface P2, the resistor R6 and the resistor R7 are connected with a seventh pin and a sixth pin of the main control chip U1 respectively, the triode Q3 is connected with the resistor R5, the triode Q2, the triode Q5 and the resistor R3 respectively, the triode Q2 is connected with the resistor R4, the triode Q4 and the resistor R3 respectively, the triode Q4 and the triode Q5 are connected with the resistor R6 and the resistor R7 respectively, the resistor R3 is connected with the liquid crystal screen interface P2, and the liquid crystal screen interface P2 is connected with a liquid crystal screen.

[0023] Specifically, the multifunctional handwriting board control circuit further comprises an indicator lamp control circuit and a lithium battery protection circuit, the indicator lamp control circuit comprises a resistor R1, a resistor R13, a light emitting diode LR and a light emitting diode LG, the resistor R1 is connected with a third pin of the main control chip U1 and the light emitting diode LR respectively, and the resistor R13 is connected with a second pin of the main control chip U1 and the light emitting diode LG respectively; the lithium battery protection circuit comprises a lithium battery protection chip U4, a resistor R9 and a capacitor C6, the resistor R9 and the capacitor C6 are connected with the lithium battery protection chip U4, and the resistor R9 is connected with the battery BT1. It can be understood that the lithium battery protection chip U4 can be an LP3230 DW03 chip.

[0024] It can be understood that the utility model discloses reasonable design, unique structure, in actual application, user can enter the setting interface through the operation button or menu, select the time of timing screen clearing, and the timer in the main control chip U1 will start countdown according to the set time, when the timer countdown ends, the main control chip U1 will send a signal to the screen clearing voltage boosting circuit, and the screen clearing voltage boosting circuit will control the flip screen clearing discharging circuit to apply specific voltage to the electrode layer of the liquid crystal screen after receiving the signal, so that the voltage is applied to the electrode layer of the liquid crystal screen, the liquid crystal molecules restore to the initial state, thereby clearing the content on the screen.

[0025] The embodiments of the present application are described in detail in combination with the drawings, but the present application is not limited to the described embodiments. For those skilled in the art, various changes, modifications, replacements and variations of the embodiments can be made without departing from the principles and spirits of the present application, and still fall within the protection scope of the present application.

Claims

1. A multifunctional handwriting tablet control circuit, characterized in that: The system includes a high-intensity light-to-electrical-energy input charging circuit, a main control chip circuit, a screen clearing button multiplexing circuit, a screen clearing boost circuit, and a flip-to-clear-discharge circuit. All of these circuits are electrically connected to the main control chip circuit. The high-intensity light-to-electrical-energy input charging circuit is charged via a connected optical energy circuit board. The main control chip circuit periodically sends screen clearing signals to the screen clearing boost circuit, which in turn controls the flip-to-clear-discharge circuit to apply voltage to the electrode layer of the liquid crystal screen, thereby controlling the alignment direction of the liquid crystal molecules.

2. The multifunctional handwriting tablet control circuit according to claim 1, characterized in that: The main control chip circuit includes a main control chip U1 and a capacitor C1, wherein the capacitor C1 is connected to the main control chip U1.

3. The multifunctional handwriting tablet control circuit according to claim 2, characterized in that: The high-intensity light-to-electricity input charging circuit includes a high-intensity light charging interface P1, a charging management chip U2, an inductor L2, a diode D2, a resistor R8, a resistor R15, and a battery BT1. The high-intensity light charging interface P1, the inductor L2, the diode D2, and the resistor R8 are all connected to the charging management chip U2. The resistor R15 is connected to the resistor R8 and the battery BT1. The battery BT1 is connected to the main control chip U1.

4. The multifunctional handwriting tablet control circuit according to claim 2, characterized in that: The screen clearing button multiplexing circuit includes a resistor R14, a button S1 and a button S2. The resistor R14 is connected to the button S2 and the battery BT1 respectively. The buttons S1 and S2 are both connected to the main control chip U1.

5. The multifunctional handwriting tablet control circuit according to claim 2, characterized in that: The screen clearing boost circuit includes an inductor L1, a transistor Q1, a diode D1, a resistor R2, a capacitor C2, a capacitor C3, and a capacitor C4. The transistor Q1 is connected to the inductor L1, the diode D1, the resistor R2, and the capacitor C2. The capacitors C3 and C4 are both connected to the diode D1. The inductor L1 is connected to the first pin of the main control chip U1, and the resistor R2 is connected to the fifth pin of the main control chip U1.

6. The multifunctional handwriting tablet control circuit according to claim 2, characterized in that: The flip-to-clear-discharge circuit includes transistors Q2, Q3, Q4, and Q5, resistors R3, R4, R5, R6, and R7, and an LCD screen interface P2. Resistors R6 and R7 are connected to the seventh and sixth pins of the main control chip U1, respectively. Transistor Q3 is connected to resistors R5, Q2, and R3. Transistor Q2 is connected to resistors R4, Q4, and R3. Transistors Q4 and Q5 are connected to resistors R6 and R7, respectively. Resistor R3 is connected to the LCD screen interface P2, which is connected to the LCD screen.

7. The multifunctional handwriting tablet control circuit according to claim 2, characterized in that: It also includes an indicator light control circuit, which includes resistors R1 and R13, LED LR and LED LG. Resistor R1 is connected to the third pin of the main control chip U1 and LED LR, and resistor R13 is connected to the second pin of the main control chip U1 and LED LG.

8. The multifunctional handwriting tablet control circuit according to claim 3, characterized in that: It also includes a lithium battery protection circuit, which includes a lithium battery protection chip U4, a resistor R9 and a capacitor C6. The resistor R9 and the capacitor C6 are both connected to the lithium battery protection chip U4, and the resistor R9 is connected to the battery BT1.

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