JPH0633452Y2 - Driving circuit for electrochromic antiglare mirror - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a driving device for an electrochromic device, and more particularly to driving an electrochromic anti-glare mirror in which a driving current time for coloring and erasing an electrochromic device is set by a switching operation. It is about circuits.

[Prior Art and its Problems] Conventionally, liquid crystal is generally used as a driven element such as a display element. This liquid crystal is widely used in the fields of calculators, wrist watches and the like because it can operate at low voltage and is thin.

On the other hand, the electrochromic device (hereinafter abbreviated as "ECD") utilizes the reversible change of coloring due to an electrochemical reaction, and has a clearer display and a smaller viewing angle dependency than liquid crystal. Has the characteristics of. Therefore, these features are being utilized in many industrial fields including display elements.

However, in the conventional drive device for the ECD anti-glare mirror, the timer circuit is used because the continuous application of the constant voltage or the constant current causes the deterioration of the electrochromic element. In this conventional circuit, when the timer circuit is driven, that is, when the switch is switched to the coloring side or the erasing side while the timer is operating, the coloring side output stage and the erasing side output stage become conductive at the same time, and the circuit becomes There was a short circuit condition.

The object of the present invention is to switch the colored stage to the decolored state or to switch from the decolorized state to the colored state while the timer is operating. An object of the present invention is to provide a drive circuit for an electrochromic antiglare mirror which can prevent short circuit and control the ECD to an arbitrary reflectance by resetting the switch while the timer is operating.

[Means for Solving the Problems] As a means for solving the above problems, in the drive circuit of the anti-glare mirror using the electrochromic device (ECD) of the present invention, the ECD is driven to the colored and decolored states. A timer circuit for setting the drive energization time required at that time, and a trigger signal for outputting the trigger signal to the timer circuit to operate the timer circuit to drive the ECD to the decolored state.
Second trigger circuit for driving the ECD and the ECD to the colored state, a switching circuit for switching between coloring and erasing that operates by the output of the timer circuit, and a reset connected to the reset terminal of the timer circuit. A contact, an erasing contact connected to the first trigger circuit and a colored contact connected to the second trigger circuit,
The reset contact is disposed between the colored contact and the decolorized contact, and the reset contact is provided when the ECD is switched from the colored state to the decolored state or from the decolored state to the colored state. And a color change switch for resetting the timer circuit.

[Operation] Based on the above structure, the ECD is switched to the colored or decolored state by activating the timer circuit by the coloring / decoloring changeover switch in which the decoloring contact, the reset contact and the coloring contact are arranged in this order.

When switching from the colored state to the decolored state or vice versa, be sure to pass the reset contact to reset the timer circuit.

[Embodiment] Next, the drive circuit of the present invention will be described in detail with reference to the drawings.

The drawing shows the driving circuit of the electrochromic antiglare mirror of the present invention.

In the figure, reference numeral 1 is an ECD (electro-chromic element). The ECD1 may be either all solid type or gel type. In the case of the all-solid-state type, the glass substrate is provided with an electrode layer made of a transparent conductive film, an EC layer that is a coloring layer, a conductive layer made of an aluminum layer, and a sealing resin layer, and then glass is laminated on the outermost layer. In the case of gel type, a glass substrate, an electrode layer made of a transparent conductive film, an encapsulated EC electrolytic solution (gel) that develops color, an electrode layer made of a transparent conductive film, a glass substrate, an aluminum layer and a protective film. It consists of In any case, the outermost layer is fixed to the mirror support by adhesion or caulking (not shown).

When a coloring current or a coloring voltage is applied to the electrode layer, the mirror reflectance is lowered, and when a decoloring current or a decoloring voltage is applied to the electrode layer, the mirror reflectance is increased.

In the drive circuit of the ECD anti-glare mirror of this embodiment, the ECD 1 is connected to the timer circuit 3 via the switching circuit 2.
Diodes D1 to D4 are connected in parallel with ECD1.
The diodes D1 to D4 are ECD protection diodes. The switching circuit 2 has a transistor TR1 and a transistor TR2, and a transistor TR3 and a transistor TR4, which are connected in cascade.
Resistors R11, R12, R13, R14 are respectively connected to the bases of 2, TR3, TR4, and the first output Q1 and the first output of the timer circuit 3 are connected to the contacts A, B of the resistors R11, R14 and resistors R12, R13, respectively. Two
Output Q2 of is connected.

The ECD color-decoloring switch 4 is a switch for switching three positions for switching the input of the timer circuit 3, and is composed of a color-erasing contact 4a, a reset contact 4b and a colored contact 4c, and the reset contact 4b is a color-erasing contact 4a and a colored contact 4c. It is located between The erasing contact 4a is connected to the first trigger terminal T1 of the timer circuit 3 via the first trigger circuit 5, and the reset contact 4b is connected to the reset terminals R1 and R2 of the timer circuit 3. Also, the colored contact 4c is the second trigger circuit 6
Via the second trigger terminal T2 of the timer circuit 3. As the switch 4, a slide switch, a toggle switch, a rocker switch or the like is used.

In the first trigger circuit 5, one of the input terminals of the NAND circuit 5a
Connect the decoloring contact 4a to 5a1 and connect the output side of the NAND circuit 5a to
The time constant circuit 5b is connected. One of the input terminals of the NAND circuit 5c, 5c1, is connected to the time constant circuit 5b via a resistor R6. The output terminal of the NAND circuit 5c is connected to the first trigger terminal T1 of the timer circuit 3 via the resistor R7. In addition, in the first trigger circuit 5 of the present embodiment, the resistor R5
Is connected to the power supply line 7 and the input end 5a of the NAND circuit 5a is connected.
An output terminal of the NAND circuit 5c is connected to the input terminal 2, and an input terminal 5c2 of the NAND circuit 5c is connected to the power supply line 7. Second
The trigger circuit 6 is a circuit connected between the colored contact 4c and the second trigger terminal T2 of the timer circuit 3, and since the configuration of the second trigger circuit 6 is the same as that of the first trigger circuit 5, The description is omitted.

Next, the circuit 8 and EC externally attached to the timer circuit 3
The drive power supply unit of D1 will be described. An externally attached timer drive time setting circuit 8 is connected to the timer circuit 3. The timer drive time setting circuit 8 includes a time constant circuit 8b that determines the coloring application energization time and a time constant circuit 8a that determines the decoloring application energization time. The timer drive time setting circuit 8 is connected to the power supply stabilizing circuit 9 via the power supply line 7. The power supply stabilization circuit 9 includes a reverse connection protection diode D5, a Zener diode D6, a current limiting resistor R8, a smoothing capacitor C1, and a three-terminal regulator 9C when the power supply is connected. Further, the voltage converted into a constant voltage by the Zener diode D6 is converted into a constant current by the constant current circuit 10 and connected to the switching circuit 2.

Next, the operation of this embodiment will be described.

First, turn on the ACC or the ignition switch 11. E
If you want to lower the reflectance of CD1 (higher the coloring density), use E
The CD color change switch 4 is turned on to the colored contact 4c. Then, a low pulse is applied to the second trigger terminal T2 of the timer circuit 3 via the trigger circuit 6. A flip-flop (not shown) that receives a pulse at this time is set, and a high level signal from the output terminal Q2 of the timer circuit 3 causes the base resistance R1 of the transistors TR2 and TR3 of the switching circuit 2.
2, input to R13. This allows transistors TR2 and T
R3 becomes conductive, and a constant current is applied from the constant current circuit 10 to the colored side of ECD1 for the timer operating time.

Further, when the reflectance of the ECD 1 is made high (the coloring density is made low), the ECD attachment / decoloration changeover switch is turned on to the decoloring contact 4a. When switching from the colored contact 4c to the erasing contact 4a, the colored contact 4c is always switched to the reset contact 4b and then to the erasing contact 4a. When the reset contact 4b is switched, a low level signal is input to the reset input terminals R1 and R2 of the timer circuit 3, and the flip-flop is set. When the reset contact 4b is switched to the erasing contact 4a, a low pulse is input to the first trigger terminal T1 of the timer circuit 3 via the trigger circuit 5. At this time, a flip-flop (not shown) is set, and a high level signal is input from the output terminal Q1 of the timer circuit 3 to the bases of the transistors TR1 and TR4 of the switching circuit 2. This allows transistors TR1 and TR4
Is conducted, and a constant current is applied from the constant current circuit 10 to the erasing side of the ECD 1 for the timer operating time. At this time, the reflectance of ECD1 is made high (coloring density is made low).

In the drive circuit of the electrochromic antiglare mirror of the present embodiment, even if the ECD coloring / erasing color changing switch is switched from the coloring side to the decoloring side during the timer operation, or from the decoloring side to the coloring side, it is respectively changed at the time of switching. Since the driving state of is always reset, there is no short circuit between the colored output stage and the erased output stage of the switching circuit. Further, the intermediate density state can be maintained by returning the switch to the reset mode at an arbitrary timing while the timer of each mode is operating.

[Advantages of the Invention] According to the present invention, even if the electrochromic anti-glare mirror's color change switch is changed to the color erasing side or the color side during timer operation, the output stage on the color side and the output stage on the color side are Since it does not conduct at the same time, circuit damage can be prevented and a reset input of the timer is provided in the middle of the color change switch to control the ECD to an arbitrary reflectance according to the driving situation and the driver's preference. can do.

[Brief description of drawings]

The drawing shows the driving circuit of the electrochromic antiglare mirror of the present invention. 1 ... ECD, 2 ... switching circuit, 3 ... timer circuit, 4 ... ECD color change switch, 4a ... decolor contact, 4b ... reset contact, 4c ... color contact, 5 ... No. 1
Trigger circuit, 6 ... Second trigger circuit, 7 ... Power line, 8 ... Timer drive time setting circuit, 9 ... Stabilized power circuit, 10 ... Constant current circuit, 11 ... ACC or ignition switch .

Claims (1)

[Scope of utility model registration request] 1. A drive circuit for an anti-glare mirror using an electrochromic device (ECD), comprising a timer circuit for setting a drive energization time when the ECD is driven into a colored or decolored state, and a trigger for the timer circuit. A first trigger circuit that outputs a signal to drive the ECD to the decolored state and a second trigger circuit that drives the ECD to the colored state, and a switching for coloring and decoloring switching that is activated by the output of the timer circuit. A reset contact connected to the reset terminal of the timer circuit, a decoloring contact connected to the first trigger circuit, and a colored contact connected to the second trigger circuit, wherein the reset contact is The ECD is disposed between the colored contact and the decolorized contact, and before switching the ECD from the colored state to the decolored state or from the decolored state to the colored state. A driving circuit for an electrochromic antiglare mirror, comprising: a color changing switch for resetting the timer circuit through a reset contact.