Electrochromic device, lens unit, imaging device, window member, and method of driving electrochromic element
AssigneeCanon Kabushiki Kaisha
InventorWataru Kubo
Life of this patent
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Abstract
The present disclosure repeatedly supplies, when controlling gradation of transmittance, a first voltage for advancing an electrochemical reaction for decreasing transmittance of an electrochromic layer and a second voltage for advancing an electrochemical reaction for increasing the transmittance of the electrochromic layer, in a time domain in which the electrochemical reaction of the electrochromic layer in the electrodes progresses in the first region and transmittance change of the first region is not visible.
Claims16
An electrochromic device comprising:
- an electrochromic element including a pair of electrodes, an electrochromic layer disposed between the pair of electrodes, and interconnections connected to the pair of electrodes;
- and
- a driving circuit that is connected to the pair of electrodes and supplies voltages to the pair of electrodes via the interconnections,
- wherein the electrochromic element is an electrochromic element that forms a gradation of transmittance in a transmittance changing portion where the electrochromic layer is disposed, by resistance of the electrodes,
- wherein the transmittance changing portion has a first region for forming a first light transmissive state at a position in the electrodes close to the interconnections in the transmittance changing portion, and a second region for forming a second light transmissive state at a position in the electrodes farther from the interconnections than the first region,
- wherein, the driving circuit repeatedly supplies, when controlling the gradation of the transmittance, a first voltage for advancing an electrochemical reaction for decreasing transmittance of the electrochromic layer and a second voltage for advancing an electrochemical reaction for increasing the transmittance of the electrochromic layer, in a frequency in which the electrochemical reaction of the electrochromic layer in the electrodes progresses in the first region and transmittance change of the first region is not visible, and
- wherein the frequency at which the driving circuit repeatedly supplies the first voltage and the second voltage is 24 Hz or more.
A driving method of an electrochromic element including a pair of electrodes, an electrochromic layer disposed between the pair of electrodes, and interconnections connected to the pair of electrodes,
- wherein the electrochromic element is an electrochromic element that forms a gradation of transmittance in a transmittance changing portion where the electrochromic layer is disposed, by resistance of the electrodes, and
- wherein the transmittance changing portion has a first region for forming a first light transmissive state at a position in the electrodes close to the interconnections in the transmittance changing portion, and a second region for forming a second light transmissive state at a position in the electrodes farther from the interconnections than the first region, the driving method comprising:
- repeatedly supplying, when supplying voltages to the pair of electrodes via the interconnections and controlling the gradation of the transmittance, a first voltage for advancing an electrochemical reaction for decreasing transmittance of the electrochromic layer and a second voltage for advancing an electrochemical reaction for increasing the transmittance of the electrochromic layer, in a frequency in which the electrochemical reaction of the electrochromic layer in the electrodes progresses in the first region and transmittance change of the first region is not visible,
- wherein the frequency at which the first voltage and the second voltage are repeatedly supplied is 24 Hz or more.
Dependencies are inferred from the claim text.