Electrophoretic information display (EPID) apparatus employing grey scale capability
First Claim
1. Apparatus for providing grey scale capability for an electrophoretic information display (EPID), comprising:
- timing generator means coupled to said display and operative to provide a voltage waveform for energizing said display and means for selecting the duration of said waveform as applied to said display according to a desired grey scale level.
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Abstract
Various techniques and apparatus for grey scale operation for an electrophoretic display panel (EPID) are provided. The apparatus includes circuitry with a timing generator which produces a plurality of different time duration output waveforms which are applied to the X and Y drivers associated with the EPID. In this manner by applying a set of voltages for a given short time interval, a display is provided which results in the incomplete removal of pigment from an associated selected pixel. Hence, that pixel appears darker than surrounding pixels but not as dark as the pure dye solution as associated with the display. The amount of pigment removed and hence the darkness of each pixel is a function of the time duration during which appropriate voltages are applied to the rows and columns of the EPID. In this manner the timing generator can cause different pixels as displayed to have different darknesses or grey scale values by varying the time during which the voltage is applied to the display.
151 Citations
20 Claims
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1. Apparatus for providing grey scale capability for an electrophoretic information display (EPID), comprising:
timing generator means coupled to said display and operative to provide a voltage waveform for energizing said display and means for selecting the duration of said waveform as applied to said display according to a desired grey scale level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of providing grey scale capability for an electrophoretic information (EPID) display, of the type employing X-Y pixel selection comprising the steps of:
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selecting one of a plurality of different duration waveforms each at a given voltage level and each indicative of one of a plurality of grey scale values, applying said one selected waveform to given X-Y pixel locations of said display to provide said one grey scale level at any desired one of said X-Y pixel locations. - View Dependent Claims (11, 12, 13)
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14. Apparatus for operating an electrophoretic information display (EPID) with grey scale capability, said EPID of the type having a plurality of pixel areas each accessible by an X-Y addressing format and each indicative of a given display content at that associated display area comprising,
selectable timing means operative to provide at an output a plurality of selectable waveforms of a duration determined according to a different grey scale value, adressing means operative to select any one of said given pixel areas and responsive to a selected duration waveform for applying the same to said selected pixel areas whereby each waveform selected can cause said area to manifest a different one of said grey scale values including a black and a white value.
Specification