TWI767363B - LCD glass panel modulation circuit - Google Patents

Abstract

A liquid crystal glass plate modulation circuit mainly triggers a vibration sensing element by tapping a glass plate, and outputs a first pulse wave through a Schmitt trigger circuit and a flip-flop, and a logic judging component again According to the first pulse wave and a second pulse wave generated by a pulse wave generating element, a high voltage or a low voltage is output, and a first transistor, a second transistor and a third transistor are based on the high voltage Or the low voltage is turned on or off respectively, thereby changing a liquid crystal layer to a first state or a second state. The liquid crystal glass plate modulation circuit can be integrated into an IC, which is convenient to be applied to a miniaturized voltage control circuit, and the liquid crystal glass plate modulation circuit can better control the liquid crystal layer.

Description

LCD glass panel modulation circuit

The present invention relates to a liquid crystal glass plate modulation circuit, especially a modulation circuit which applies high voltage to the positive and negative poles of the liquid crystal layer to change the transparency of the liquid crystal layer.

Traditional liquid crystal voltage control circuits are high-voltage driving circuits. In order to provide related high-voltage circuits, the design of voltage control circuits composed of various discrete circuit components is accompanied by considerable stray resistance and capacitance, which is not suitable for miniaturized voltage control circuits.

With the development of science and technology, reducing the circuit is the goal of each technology factory. However, if the traditional liquid crystal voltage control circuit is directly integrated into an IC, the function of the liquid crystal voltage control circuit is often not achieved, and the control of the liquid crystal is still poor.

Therefore, in order to better control the liquid crystal after the liquid crystal voltage control circuit is integrated into an IC, the present inventor proposes a liquid crystal glass plate modulation circuit, which is combined with a glass plate. The liquid crystal glass plate modulation circuit includes: a first voltage source; a vibration sensing element, combined with the surface or the middle layer of the glass plate, the vibration sensing element is electrically connected to the first voltage source; a Schmitt trigger circuit is electrically connected to the vibration sensor testing element; a flip-flop electrically connected to the Schmitt trigger circuit; a logic judging component having an input end and an output end, the flip-flop being electrically connected to the input end of the logic judging component; a pulse wave A generating element is electrically connected to the input end of the logic judging component; a first transistor is electrically connected to the output end of the logic judging component; a second transistor is electrically connected to the first transistor; a first transistor three transistors, electrically connected to the second transistor; and a liquid crystal layer including a plurality of liquid crystal molecules, the liquid crystal layer is combined with the glass plate, the liquid crystal layer is electrically connected to the second transistor and the third transistor; by tapping the The glass plate triggers the vibration sensing element, and outputs a first pulse wave through the Schmitt trigger circuit and the flip-flop. The second pulse wave outputs a high voltage or a low voltage, the first transistor, the second transistor and the third transistor are respectively turned on or off according to the high voltage or the low voltage, thereby changing the liquid crystal layer to A first state or a second state, wherein the first state is one of the regular arrangement or irregular arrangement of the liquid crystal molecules of the liquid crystal layer, and the second state is the regular arrangement of the liquid crystal molecules of the liquid crystal layer Another state of arrangement or irregular arrangement.

Further, the logic judging component includes an AND gate, and an anti-gate electrically connected to the AND gate, the AND gate is electrically connected to the flip-flop and the pulse wave generating element, and the anti-gate is electrically connected to the first transistor and the third transistor.

One end of the vibration sensing element is grounded, the other end of the vibration sensing element is electrically connected to one end of the Schmitt trigger circuit, and the other end of the Schmitt trigger circuit is electrically connected to a pulse wave of the flip-flop an input pin, a data input pin of the flip-flop is electrically connected to a reverse output pin of the flip-flop, an output pin of the flip-flop and the pulse wave generating element are both electrically connected to the and A gate and a gate input terminal of the gate are electrically connected to an anti-gate input terminal of the anti-gate, and an anti-gate output terminal of the anti-gate is electrically connected to the gate of the first transistor , the source of the first transistor is grounded, the drain of the first transistor is electrically connected to the gate of the second transistor, and the source and drain of the second transistor are respectively electrically connected to the liquid crystal layer. both ends, the gate of the third transistor is electrically connected to the sum gate output of the sum gate The terminal is connected to the reverse gate input terminal of the reverse gate, the drain electrode of the third transistor is electrically connected to the drain electrode of the second transistor, and the source electrode of the third transistor is grounded.

Wherein, when a first logic value of the AND gate output is 0, a second logic value of the anti-gate output is 1, which is the high voltage, the first transistor is turned on, the second transistor is turned on, The third transistor is turned off, so that a terminal voltage of the liquid crystal layer is discharged until the liquid crystal layer transitions to the first state.

Wherein, when a first logic value of the AND gate output is 1, a second logic value of the anti-gate output is 0, that is, the low voltage, the first transistor is turned off, the second transistor is turned off, The third transistor is turned on so that a terminal voltage of the liquid crystal layer is charged until the liquid crystal layer transitions to the second state.

Further, there is a first switch and a second switch, one end of the first switch is electrically connected to the drain of the second transistor, and the other end of the first switch is selectively electrically connected to the third The drain of the transistor or one end of the second switch, one end of the second switch is selectively electrically connected to the other end of the first switch, and the other end of the second switch is grounded; When a switch is electrically connected to the drain of the third transistor, the second transistor changes the liquid crystal layer to the first state or the second state according to the high voltage or the low voltage; When the first switch is electrically connected to one end of the second switch, the second transistor changes the liquid crystal layer to the first state or the second state according to whether the second switch is turned on.

Wherein, the first switch and/or the second switch are push-button switches disposed on the surface of the glass plate.

Further, there is an output capacitor, one end of the output capacitor is electrically connected to the source of the second transistor, and the other end of the output capacitor is grounded.

Wherein, the first transistor, the second transistor and the third transistor are all metal oxide semiconductor field effect transistors.

According to the above technical features, the following effects can be achieved:

1. The modulation circuit of the liquid crystal glass plate can be IC, which is convenient to be applied to the miniaturized voltage control circuit, and the modulation circuit of the liquid crystal glass plate has better control of the liquid crystal.

2. The transparency of the liquid crystal glass plate can be changed by the action of the electronic components after tapping the glass plate, which can be used in different places.

3. The pulse wave generating element can prevent the polarization fatigue of the liquid crystal layer, so that the liquid crystal layer can be restored in a timely manner, and the restoration time is less than the visual persistence time.

4. The output capacitor can store electrical energy, thereby prolonging the duration of the terminal voltage of the liquid crystal layer to maintain a high voltage.

100: LCD glass plate modulation circuit

101: Vibration sensing element

102: Input resistance

103: first voltage source

104: Input capacitance

105: Schmitt trigger circuit

106: Flip-flop

107: Third voltage source

108: First toggle switch

109: Second transistor

110: The third transistor

111: Second voltage source

112: Pulse wave generating element

113: Second toggle switch

114: and gate

115: Fourth voltage source

116: output capacitor

117: Reverse gate

118: first transistor

119: output resistance

120: liquid crystal layer

[Figure 1] is a schematic diagram of the circuit structure of the embodiment of the present invention.

In view of the above technical features, the main effects of the liquid crystal glass panel modulation circuit of the present invention will be clearly presented in the following embodiments.

Please refer to the first figure, which shows that a liquid crystal glass panel modulation circuit 100 according to an embodiment of the present invention is combined with a glass panel (not shown) to form a liquid crystal glass panel. The liquid crystal glass panel modulation circuit 100 includes: a The vibration sensing element 101, an input resistor 102, a first voltage source 103, an input capacitor 104, A Schmitt trigger circuit 105, a flip-flop 106, a third voltage source 107, a first switch 108, a second transistor 109, a third transistor 110, a second voltage source 111, a The pulse wave generating element 112 , a second switch 113 , a logic judgment element, a fourth voltage source 115 , an output capacitor 116 , a first transistor 118 , an output resistor 119 and a liquid crystal layer 120 . The logic judgment component includes an AND gate 114 and an anti-gate 117 , the first switch 108 and the second switch 113 are push-button switches disposed on the surface of the glass plate, the first transistor 118 , the second switch 113 Both the transistor 109 and the third transistor 110 are metal-oxide-semiconductor field effect transistors, and are high-voltage components.

The vibration sensing element 101 is combined with the surface or the middle layer of the glass plate, one end of the vibration sensing element 101 is grounded, and the other end of the vibration sensing element 101 is electrically connected to one end of the Schmitt trigger circuit 105 and the One end of the input capacitor 104 is electrically connected to the first voltage source 103 via the input resistor 102 , and the other end of the input capacitor 104 is grounded.

The other end of the Schmitt trigger circuit 105 is electrically connected to a pulse input pin of the flip-flop 106 , and a data input pin of the flip-flop 106 is electrically connected to an inverted output of the flip-flop 106 pin, an output pin of the flip-flop 106 and one end of the pulse wave generating element 112 are both electrically connected to one and the gate input end of the gate 114, and the other end of the pulse wave generating element 112 is electrically connected The second voltage source 111 .

A gate output terminal of the AND gate 114 is electrically connected to an antigate input terminal of the flip gate 117 , and an flip gate output terminal of the flip gate 117 is electrically connected to the gate of the first transistor 118 . The source of the first transistor 118 is grounded, the drain of the first transistor 118 is electrically connected to the gate of the second transistor 109 , and the source and drain of the second transistor 109 are electrically connected to the At both ends of the liquid crystal layer 120 , the gate of the third transistor 110 is electrically connected to the gate output terminal of the AND gate 114 and the reverse gate input terminal of the reverse gate 117 , The drain of the third transistor 110 is electrically connected to the drain of the second transistor 109 and the liquid crystal layer 120 , the source of the third transistor 110 is grounded, and the liquid crystal layer 120 is bonded to the glass plate.

One end of the first switch 108 is electrically connected to the drain of the second transistor 109 , and the other end of the first switch 108 is selectively electrically connected to the drain of the third transistor 110 or the second switch One end of the switch 113 and one end of the second switch 113 are selectively electrically connected to the other end of the first switch 108 , and the other end of the second switch 113 is grounded.

One end of the output capacitor 116 is electrically connected to the source of the second transistor 109 , and the other end of the output capacitor 116 is grounded. In a preferred embodiment of the present invention, the output capacitor 116 is a capacitor group composed of complex capacitors connected in parallel.

When implementing the liquid crystal glass panel modulation circuit 100, the liquid crystal glass panel modulation circuit 100 can be switched to a vibration control mode or a manual control mode.

The first is the vibration control mode:

To switch to the vibration control mode, it is only necessary to electrically connect the first switch 108 to the drain of the third transistor 110 . After switching to the vibration control mode, the vibration sensing element 101 is triggered by tapping the glass plate. More specifically, when the glass plate is tapped, the glass plate will vibrate, and the vibration will change the vibration sense. The resistance value of the measuring element 101 is measured. The vibration sensing element 101 is normally off. For example, if the voltage of the first voltage source 103 is between 3 and 5 volts, and the resistance value of the pull-up input resistor 102 is about 2.2MΩ, When the vibration sensing element 101 is turned off, the resistance value will exceed 400MΩ. When the glass plate vibrates and the vibration sensing element 101 is triggered and turned on, the resistance value of the vibration sensing element 101 will be lower than 1MΩ.

After the resistance value of the vibration sensing element 101 is changed, the output voltage level of the Schmitt trigger circuit 105 is changed, and then the flip-flop 106 outputs a first pulse wave corresponding to the number of times the glass plate is struck. The pulse wave generating element 112 also generates a second pulse wave. For example, it is assumed that the voltage of the fourth voltage source 115 is between 3 and 5 volts, and the low state time of the pulse wave generating element 112 is about 1 ms , the high state time of the pulse wave generating element 112 should be greater than 100ms, even as long as 1s.

The pulse wave generating element 112 can prevent the polarization fatigue of the liquid crystal layer 120 , so that the liquid crystal layer 120 can be restored in a timely manner, and preferably, the restoration time is shorter than the user's visual persistence time.

Next, the logic judging component outputs a high voltage or a low voltage according to the first pulse wave generated by the flip-flop 106 and the second pulse wave generated by the pulse wave generating element 112 . More specifically, the sum gate 114 compares the first pulse wave with the second pulse wave to output a first logic value, and the reverse gate 117 outputs a second logic value according to the first logic value.

When the first logic value output by the AND gate 114 is 0, the second logic value output by the anti-gate 117 is 1, which is the high voltage. At this time, the first transistor 118 is turned on (ON), The second transistor 109 is turned on, the third transistor 110 is turned off (OFF), and the gate terminal voltage of the second transistor 109 is close to zero volts, so that a terminal voltage of the liquid crystal layer 120 will be affected by the leakage current of the liquid crystal layer 120 and is discharged until the liquid crystal layer 120 changes to a first state.

When the first logic value output by the AND gate 114 is 1, the second logic value output by the anti-gate 117 is 0, which is the low voltage. At this time, the first transistor 118 is turned off, and the second The transistor 109 is turned off, the third transistor 110 is turned on, the gate terminal voltage of the second transistor 109 is close to the voltage of the third voltage source 107, and the third voltage source 107 is a high voltage, so that the liquid crystal layer 120 has a high voltage. The terminal voltage is charged until the liquid crystal layer 120 transitions to a second state. In more detail, at this time, the liquid crystal layer is accumulated The charge amount of 120 is much higher than the amount of charge lost by the leakage current, so the voltage of this terminal will rise instantaneously and energize instantaneously. After the voltage of this terminal rises instantaneously, the amount of charge will quickly accumulate to reach the highest voltage.

The output capacitor 116 can store electrical energy, thereby prolonging the duration that the terminal voltage of the liquid crystal layer 120 maintains a high voltage.

It should be specially added that, according to the different materials of the liquid crystal layer 120 , the first state may correspond to the regular arrangement or irregular arrangement of the liquid crystal molecules of the liquid crystal layer 120 , and the second state may also correspond to the liquid crystal molecules of the liquid crystal layer 120 . The liquid crystal molecules are regularly arranged or irregularly arranged, and the degree of transparency when the liquid crystal molecules are regularly arranged and the degree of ambiguity when the liquid crystal molecules are irregularly arranged also vary according to the material of the liquid crystal layer 120 .

Next is the manual control mode:

To switch to the manual control mode, it is only necessary to electrically connect the first switch 108 to one end of the second switch 113 . After switching to the manual control mode, the second transistor 109 changes the liquid crystal layer 120 to the first state or the second state according to whether the second switch 113 is turned on or not.

When the second switch 113 is turned off, the second transistor 109 is turned on. Similar to the case where the first logic value is 0 in the vibration control mode, the terminal voltage of the liquid crystal layer 120 will be affected by the voltage of the liquid crystal layer 120 . The leakage current is discharged until the liquid crystal layer 120 transitions to the first state.

When the second switch 113 is turned on, the second transistor 109 is turned off. Similar to the case where the first logic value is 1 in the vibration control mode, the terminal voltage of the liquid crystal layer 120 is charged until the liquid crystal layer is 120 transitions to this second state.

The liquid crystal glass panel modulation circuit 100 can be integrated into an IC, which is convenient to be applied to a miniaturized voltage control circuit, and the liquid crystal glass panel modulation circuit 100 preferably controls the liquid crystal layer 120, and can be switched to the vibration mode as required control mode or this manual control mode. The transparency of the liquid crystal glass plate can be changed by the actions of the electronic components after the glass plate is tapped, and the liquid crystal glass plate can be applied in different places.

Based on the descriptions of the above embodiments, one can fully understand the operation, use and effects of the present invention, but the above-mentioned embodiments are only preferred embodiments of the present invention, which should not limit the implementation of the present invention. Scope, that is, simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the description of the invention, all fall within the scope of the present invention.

100: LCD glass plate modulation circuit

101: Vibration sensing element

102: Input resistance

103: first voltage source

104: Input capacitance

105: Schmitt trigger circuit

106: Flip-flop

107: Third voltage source

108: First toggle switch

109: Second transistor

110: The third transistor

111: Second voltage source

112: Pulse wave generating element

113: Second toggle switch

114: and gate

115: Fourth voltage source

116: output capacitor

117: Reverse gate

118: first transistor

119: output resistance

120: liquid crystal layer

Claims (9)

A liquid crystal glass plate modulation circuit is combined with a glass plate, the liquid crystal glass plate modulation circuit comprises: a first voltage source; a vibration sensing element, combined with the surface or the middle layer of the glass plate, the vibration The sensing element is electrically connected to the first voltage source; a Schmitt trigger circuit is electrically connected to the vibration sensing element; a flip-flop is electrically connected to the Schmitt trigger circuit; a logic judgment component has an input terminal and an output terminal, the flip-flop is electrically connected to the input terminal of the logic judgment component; a pulse wave generating element is electrically connected to the input terminal of the logic judgment component; a first transistor is electrically connected to the input terminal of the logic judgment component the output end of the logic judgment component; a second transistor electrically connected to the first transistor; a third transistor electrically connected to the second transistor; and a liquid crystal layer including a plurality of liquid crystal molecules, the liquid crystal The layer is bonded to the glass plate, the liquid crystal layer is electrically connected to the second transistor and the third transistor; the vibration sensing element is triggered by tapping the glass plate, and the Schmitt trigger circuit and the positive The inverter outputs a first pulse wave, and the logic judgment component outputs a high voltage or a low voltage according to the first pulse wave and a second pulse wave generated by the pulse wave generating element. The first transistor, the The second transistor and the third transistor are respectively turned on or off according to the high voltage or the low voltage, thereby changing the liquid crystal layer to a first state or a second state, wherein the first state is a state of the liquid crystal layer. These liquid crystal molecules are regularly arranged One of the states of alignment or irregular arrangement, the second state is another state of regular arrangement or irregular arrangement of the liquid crystal molecules of the liquid crystal layer. According to the liquid crystal glass panel modulation circuit of claim 1, further, the logic judging component includes an AND gate, and an anti-gate electrically connected to the AND gate, and the AND gate is electrically connected to the flip-flop and the pulse wave generating element, and the anti-gate is electrically connected to the first transistor and the third transistor. The liquid crystal glass panel modulation circuit of claim 2, wherein one end of the vibration sensing element is grounded, the other end of the vibration sensing element is electrically connected to one end of the Schmitt trigger circuit, and the Schmitt trigger circuit is The other end is electrically connected to a pulse input pin of the flip-flop, a data input pin of the flip-flop is electrically connected to a reverse output pin of the flip-flop, and an output of the flip-flop is connected to a reverse output pin of the flip-flop. The pin and the pulse wave generating element are both electrically connected to a gate input terminal and a gate input terminal of the reverse gate. The output terminal is electrically connected to the gate of the first transistor, the source of the first transistor is grounded, the drain of the first transistor is electrically connected to the gate of the second transistor, and the second transistor is The source electrode and the drain electrode are respectively electrically connected to two ends of the liquid crystal layer, the gate electrode of the third transistor is electrically connected to the AND gate output terminal of the AND gate and the reverse gate input terminal of the reverse gate, the third transistor The drain of the transistor is electrically connected to the drain of the second transistor, and the source of the third transistor is grounded. The liquid crystal glass panel modulation circuit of claim 2, wherein when a first logic value of the AND gate output is 0, a second logic value of the reverse gate output is 1, which is the high voltage, and the The first transistor is turned on, the second transistor is turned on, and the third transistor is turned off, so that a terminal voltage of the liquid crystal layer is discharged until the liquid crystal layer changes to the first state. The liquid crystal glass panel modulation circuit of claim 2, wherein when a first logic value of the AND gate output is 1, a second logic value of the reverse gate output is 0, which is the low voltage, and the first transistor When turned off, the second transistor is turned off, and the third transistor is turned on, so that a terminal voltage of the liquid crystal layer is charged until the liquid crystal layer transitions to the second state. According to the liquid crystal glass panel modulation circuit of claim 1, further, there is a first switch and a second switch, one end of the first switch is electrically connected to the drain of the second transistor, and the first switch is The other end of the switch is selectively electrically connected to the drain of the third transistor or one end of the second switch, and one end of the second switch is selectively electrically connected to the other end of the first switch, the The other end of the second switch is grounded; when the first switch is electrically connected to the drain of the third transistor, the second transistor changes the liquid crystal layer into a the first state or the second state; when the first switch is electrically connected to one end of the second switch, the second transistor causes the liquid crystal layer to be activated according to whether the second switch is turned on or not. transition to the first state or the second state. The liquid crystal glass plate modulation circuit of claim 6, wherein the first switch and/or the second switch are push-button switches disposed on the surface of the glass plate. According to the liquid crystal glass plate modulation circuit of claim 1, further, there is an output capacitor, one end of the output capacitor is electrically connected to the source of the second transistor, and the other end of the output capacitor is grounded. The liquid crystal glass panel modulation circuit of claim 1, wherein the first transistor, the second transistor and the third transistor are all metal oxide semiconductor field effect transistors.

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