ELECTRO-OPTIC DISPLAYS, AND METHODS FOR DRIVING SAME
First Claim
Patent Images
1. An electro-optic display comprising:
- an electro-optic medium;
at least one electrode arranged to apply an electric field to the electro-optic medium;
drive means for supplying a driving pulse to the electrode;
a sensor for measuring at least one parameter affecting the behavior of the electro-optic medium and for producing an output signal representative of the parameter; and
control means for receiving the output signal from the sensor and controlling the drive means to vary the driving pulse dependent upon the output signal,wherein said sensor comprises at least one of;
(a) a temperature sensor for sensing the temperature of, or adjacent to, the electro-optic medium;
(b) a humidity sensor for sensing the humidity of, or adjacent to, the electro-optic medium; and
(c) a timer for measuring the operating time of the electro-optic medium.
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Abstract
The invention relates to electro-optic displays and methods for driving such displays. The invention provides (i) electrochromic displays with solid charge transport layers; (ii) apparatus and methods for improving the contrast and reducing the cost of electrochromic displays; (iii) apparatus and methods for sealing electrochromic displays from the outside environment and preventing ingress of contaminants into such a display; and (iv) methods for adjusting the driving of electro-optic displays to allow for environmental and operating parameters.
164 Citations
14 Claims
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1. An electro-optic display comprising:
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an electro-optic medium; at least one electrode arranged to apply an electric field to the electro-optic medium; drive means for supplying a driving pulse to the electrode; a sensor for measuring at least one parameter affecting the behavior of the electro-optic medium and for producing an output signal representative of the parameter; and control means for receiving the output signal from the sensor and controlling the drive means to vary the driving pulse dependent upon the output signal, wherein said sensor comprises at least one of; (a) a temperature sensor for sensing the temperature of, or adjacent to, the electro-optic medium; (b) a humidity sensor for sensing the humidity of, or adjacent to, the electro-optic medium; and (c) a timer for measuring the operating time of the electro-optic medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An electrochromic display comprising an electrolyte and an electrochromically-active layer comprising a nano-porous-nano-crystalline film comprising a semiconducting metal oxide having an electroactive compound which is either a p-type or n-type redox promoter or p-type or n-type redox chromophore adsorbed thereon or otherwise attached thereto, the electrolyte having a light scattering and/or reflective material dispersed therein.
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12. An electrochromic display comprising a nano-porous-nano-crystalline film comprising a semiconducting metal oxide having an electroactive compound which is either a p-type or n-type redox promoter or p-type or n-type redox chromophore adsorbed thereon or otherwise attached thereto, the display having a viewing surface through which an observer can view the display, the display also having, on the opposed side of the film from the viewing surface, a layer of a light-scattering or reflective material disposed on the film.
- 13. An electrochromic display comprising an electrochromically-active layer comprising a nano-porous-nano-crystalline film comprising a semiconducting metal oxide having an electroactive compound which is either a p-type or n-type redox promoter or p-type or n-type redox chromophore adsorbed thereon or otherwise attached thereto, the film being formed from a semiconducting metal oxide coated with at least one of silica and alumina.
Specification