Driver circuit for driving electrochromic display device
First Claim
1. In an electrochromic display device includng a common electrode and a plurality of segment electrodes, a driver circuit having a power source and connected to a decoder adapted to provide display information signals, comprising:
- a drive signal generator for generating coloring and bleaching signals in response to first and second changes in state of each of said display information signals;
a switching device composed of complementary MOSFETs connected between power source and said segment electrodes and responsive to said coloring and bleaching signals to cause an electric current from said power source to flow through said segment electrodes in directions to induce colored and bleached states, respectively;
means for applying a display erase signal; and
data control circuit coupled between said decoder and said drive signal generator to normally pass said display information signals to said drive signal generator, said data control circuit being responsive to said display erase signal to block said display information signals being applied to said drive signal generator, whereby said drive signal generator simultaneously generates a plurality of bleaching signals to cause said complementary MOSFETs of said switching device to apply an electric current from said power source simultaneously to all of said segment electrodes which have previously been in a colored state in a direction to induce bleached state for thereby automatically erasing displaying data.
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Abstract
A driver circuit for driving an electrochromic display device having switching elements connected between a power source and the electrodes of the electrochromic display device. The driver circuit includes a data controller which converts a display information signal to a signal indicating a state of non-display in response to a display erase signal applied to a control terminal. A drive signal generator is responsive to the signal from the data controller to produce a bleaching signal by which a display of the electrochromic display device is erased.
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Citations
21 Claims
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1. In an electrochromic display device includng a common electrode and a plurality of segment electrodes, a driver circuit having a power source and connected to a decoder adapted to provide display information signals, comprising:
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a drive signal generator for generating coloring and bleaching signals in response to first and second changes in state of each of said display information signals; a switching device composed of complementary MOSFETs connected between power source and said segment electrodes and responsive to said coloring and bleaching signals to cause an electric current from said power source to flow through said segment electrodes in directions to induce colored and bleached states, respectively; means for applying a display erase signal; and data control circuit coupled between said decoder and said drive signal generator to normally pass said display information signals to said drive signal generator, said data control circuit being responsive to said display erase signal to block said display information signals being applied to said drive signal generator, whereby said drive signal generator simultaneously generates a plurality of bleaching signals to cause said complementary MOSFETs of said switching device to apply an electric current from said power source simultaneously to all of said segment electrodes which have previously been in a colored state in a direction to induce bleached state for thereby automatically erasing displaying data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. In an electrochromic display device for an electronic timepiece including a logic circuit adapted to provide logic information signals, and a decoder coupled to said logic circuit to provide display information signals in response to said logic information signals, said electrochromic display device including a common electrode and a plurality of segment electrodes, a driver circuit comprising:
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a drive signal generator coupled to said decoder for generating coloring and bleaching signals in response to first and second changes in state of each of said display information signals; a switching device composed of complementary MOSFETs connected between a power source and said segment electrodes and responsive to said coloring and bleaching signals to cause an electric current from said power source to flow through said segment electrodes in directions to induce colored and bleached states, respectively; a control terminal for inputting a display erase signal therefrom; and data control circuit coupled between said decoder and said drive signal generator to normally pass said display information signals to said drive signal generator, said data control circuit being responsive to said display erase signal to block said display information signals being applied to said drive signal generator, whereby said drive signal generator simultaneously generates a plurality of bleaching signals to cause said complementary MOSFETs of said switching device to apply an electric current from said power source simultaneously to all of said segment electrodes which have previously been in a colored state in a direction to induce bleached state for thereby automatically erasing a display from said display device. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. In an electrochromic display device for an electronic timepiece including a logic circuit adapted to provide logic information signals, and a decoder coupled to said logic circuit to provide display information signals in response to said logic information signals, said electrochromic display device including a common electrode and a plurality of segment electrodes, a driver circuit comprising:
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a drive signal generator coupled to said decoder for generating coloring and bleaching signals in response to first and second changes in state of each of said display information signals; a switching device composed of complementary MOSFETs connected between a power source and said segment electrodes and responsive to said coloring and bleaching signals to cause an electric current from said power source to flow through said segment electrodes in directions to induce colored and bleached states, respectively; a control terminal for inputting a display erase signal therefrom; a power source installation detector coupled to said control terminal and including detection means for generating said display erase signal when said power source is installed into said electronic timepiece; and data control circuit coupled between said decoder and said drive signal generator to normally pass said display information signals to said drive signal generator, said data control circuit being responsive to said display erase signal to block said display information signals being applied to said drive signal generator, whereby said drive signal generator simultaneously generates a plurality of bleaching signals to cause said complementary MOSFETs of said switching device to apply an electric current from said power source simultaneously to all of said segment electrodes in a direction to induce bleached state for thereby automatically erasing a display from said display device when said power source is installed into said electronic timepiece. - View Dependent Claims (19, 20, 21)
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Specification