Method and apparatus for driving electrochromic display device
First Claim
1. In an electronic timepiece having a frequency standard for providing a higher frequency signal, a frequency converter to divide the higher frequency signal down to a lower frequency signal, a time counter coupled to the frequency converter to provide time information signals in response to the lower frequency signal, a decoder coupled to the time counter for generating decoded signals in dependence on the time information signals, and an electrochromic display device having display elements for displaying the decoded signals, the combination comprising:
- signal generation means coupled between the frequency converter and the time counter to generate frst, second and third phase signals in response to the lower frequency signal;
means for presetting the count value in the time counter to cuase said time counter to provide a count value signal prior to a time represented by said count value signal;
a first latch circuit coupled to the decoder and responsive to said second phase signal and said decoded signals to generate a bleaching signal for bleaching the display elements at a first timing;
a second latch circuit coupled to the decoder and responsive to said third phase signal and said decoded signals to generate a coloration signal for coloring the display elements at a second timing.
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Abstract
An electronic timepiece in which a high frequency signal from a frequency standard is divided down to a low frequency signal by a frequency converter. A decade decimal counter is connected between the frequency converter and a time counter to generate first, second and third phase signals in response to the low frequency signal from the frequency converter. The time counter is responsive to the first phase signal to gradually increment the count value therein, and is arranged such that it generates a reference time information signal prior to current time. First and second memory circuits are arranged to receive an output from a decoder in which the reference time information signal is converted into code format. The first and second memory circuits are responsive to the second and third phase signals from the decade decimal counter and to the coded signals from the decoder to generate bleaching signals and coloration signals, respectively, prior to current time.
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Citations
10 Claims
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1. In an electronic timepiece having a frequency standard for providing a higher frequency signal, a frequency converter to divide the higher frequency signal down to a lower frequency signal, a time counter coupled to the frequency converter to provide time information signals in response to the lower frequency signal, a decoder coupled to the time counter for generating decoded signals in dependence on the time information signals, and an electrochromic display device having display elements for displaying the decoded signals, the combination comprising:
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signal generation means coupled between the frequency converter and the time counter to generate frst, second and third phase signals in response to the lower frequency signal; means for presetting the count value in the time counter to cuase said time counter to provide a count value signal prior to a time represented by said count value signal; a first latch circuit coupled to the decoder and responsive to said second phase signal and said decoded signals to generate a bleaching signal for bleaching the display elements at a first timing; a second latch circuit coupled to the decoder and responsive to said third phase signal and said decoded signals to generate a coloration signal for coloring the display elements at a second timing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of driving display elements of an electrochromic display device of an electronic timepiece having a frequency standard to provide a higher frequency signal, a frequency converter coupled to the frequency standard to divide the higher frequency signal down to a lower frequency signal, and a time counter responsive to the lower frequency signal to provide a time information signal, comprising the steps of:
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generating first, second and third phase signals in response to the lower frequency signal from the frequency converter; applying the first phase signal to the time counter to gradually increment the count value therein in response to the first phase signal; presetting the time counter such that it generates a count value signal prior to a time represented by said count value signal; generting a bleaching signal in response to said second phase signal and said count value signal for bleaching the display elements at a first timing; and generating a coloration signal in response to said third phase signal and said count value signal for coloring the display elements at a second timing.
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Specification