Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Patent
1995-10-20
2000-09-12
Shingleton, Michael B
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
3151691, G09G 310
Patent
active
061182192
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a driver for driving a driving unit designed to be driven by a high-voltage alternating current. More particularly, this invention is concerned with an improvement in a driver that must produce a high voltage from a low-voltage power source such as a battery so as to make an electroluminescent device, for small-sized electronic equipment, glow.
BACKGROUND ART
In recent years, diverse types of wristwatches, from medium-priced to low-priced types, have been introduced in an effort to cope with numerous market needs. With the spread of personal computers, a lamp based on an electroluminescent (hereinafter EL) device has evolved as a thin lamp for liquid-crystal displays. The EL lamp is thin, adopts of field emission, and has a beautiful glow color. Clocks, in which an EL lamp is incorporated and which have a digital, combination, or analog displays, have been put on the market as multi-function clocks.
An example of the system configuration will be described in conjunction with a drawing. FIG. 2 shows an example of system configuration for an EL driver 1 including a clock mechanism with a known EL lamp. A general example of a system configuration for a clock is illustrated. Reference numeral 41 denotes a clock means. 42 denotes a time display means corresponding to a motor with indicators for an analog clock or a liquid-crystal display for a digital clock. 43 denotes a time display means driving means. S44 denotes a time display means driving signal that is provided by the time display means driving means 43. These components are involved in a time display in a clock. 1 denotes an EL driver. 2 denotes a battery serving as a first power source. 3 denotes a waveform shaping means. 4 denotes a second supply voltage producing means. 5 denotes an EL driving means. 9 denotes an EL lamp. The battery 2 serves as a first power source for the EL driver and a power source for the clock means 41. V11 denotes first supply voltage. V12 denotes second supply voltage. S14 is a driving input signal produced by the waveform shaping means 3. S15 denotes a driving output signal causing the EL lamp 9 to glow. S27 denotes a second supply voltage boosting signal produced by the waveform shaping means 3. The waveform shaping means 3 uses the first supply voltage 11 supplied from the battery 2 to produce the driving input signal S14 used for driving the EL lamp and the second supply voltage boosting signal S27. For causing the EL lamp to glow, alternating current (hereinafter AC) voltage having an amplitude of several tens of volts must be applied. The second supply voltage producing means 4 is used as a power source to produce the second supply voltage V12 for use in driving the EL lamp. The second supply voltage V12 is then fed to the EL driving means 5. The EL driving means 5 receives the driving input signal S14 from the waveform shaping means 3, produces the driving output signal S15 that is an AC signal having the same amplitude as the second supply voltage V12, applies the driving output signal S15 to the EL lamp 9, and thus causes the EL lamp 9 to glow.
Next, the system configuration will be described in detail in conjunction with drawings. FIG. 3 is a schematic diagram showing the circuitry of a general example constructed according to the system configuration shown in FIG. 2. When a semiconductor device is used, a CMOS device will be adopted. FIG. 5 is a timing chart concerning FIG. 3. To begin with, the configuration will be detailed in conjunction with FIG. 3. Reference numeral 41 denotes a clock means for providing timing pulses for small-sized electronic equipment. 53 denotes a crystal oscillator for generating a reference signal for the clock means 41. S21 denotes a reference signal provided by the crystal oscillator.
Reference numeral 3 denotes a waveform shaping means composed of a frequency divider 8, a NAND 60, and inverters 61 and 62. S22 denotes a fraction signal provided by the frequency divider and fed to the NAND 60 and inverters 61 and 62. S27 is a second s
REFERENCES:
patent: 3995177 (1976-11-01), Sirocks et al.
patent: 4527096 (1985-07-01), Kindlmann
patent: 5103387 (1992-04-01), Rosenbaum et al.
Form PCT/ISA/210.
Ochiai Shozo
Okigami Tomio
Citizen Watch Co. Ltd.
New Japan Radio Co. Ltd.
Shingleton Michael B
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