ELECTROPHORETIC DISPLAY DEVICE HAVING IMPROVED COLOR GAMUT
First Claim
1. An electrophoretic display device, comprising:
- a first substrate defining a plurality of sub-pixel areas;
sub-pixel electrodes formed in respective ones of the sub-pixel areas of the first substrate; and
a plurality of differently colored sub-color filters corresponding to the sub-pixel electrodes and formed in a second substrate facing the first substrate, where an area of the sub-color filter is substantially less than an area of the sub-pixel electrode.
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Abstract
An electrophoretic display device has a first substrate that defines a plurality of sub-pixel areas; with shaped pixel electrodes formed in the sub-pixel areas. A second substrate is attached in facing relation to the first substrate during mass production. The second substrate has color filters of different colors (e.g., R, G, B). The areas of the color filters are less than the areas of their corresponding sub-pixel electrodes so as to thereby avoid or reduce a color mixture effect that may arise from mass production misalignment between the first and second substrates. In one class of embodiments, area consumed by the color filters is less than about 75% but more than about 45% of area consumed by respective pixel areas. Each pixel area comprises a white (W) sub-pixel area in addition to the differently colored sub-pixel areas (e.g., R, G, B).
91 Citations
20 Claims
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1. An electrophoretic display device, comprising:
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a first substrate defining a plurality of sub-pixel areas; sub-pixel electrodes formed in respective ones of the sub-pixel areas of the first substrate; and a plurality of differently colored sub-color filters corresponding to the sub-pixel electrodes and formed in a second substrate facing the first substrate, where an area of the sub-color filter is substantially less than an area of the sub-pixel electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An electrophoretic display having plural pixel areas whose light reflecting and/or light absorbing states are selectively controlled by plural sub-pixels disposed in each of the pixel areas, where each pixel area is characterized by:
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having at least first through third independently controlled sub-pixel areas that respectively comprise first through third color filters of respective first through third different colors for thereby respectively controlling luminance of colored lights therefrom, each of the first through third sub-pixel areas having a sub-pixel electrode associated therewith; having at least one independently controlled, fourth sub-pixel area that does not comprise a color filter, the fourth sub-pixel area also having a sub-pixel electrode associated therewith; wherein said first through third color filters are spaced apart from one another so as to thereby avoid or reduce a color mixture effect that may arise from mass production misalignment of the first through third color filters relative to the sub-pixel electrodes of the first through third sub-pixel areas; and wherein said first through third color filters are each smaller in area than their associated sub-pixel electrode so as to thereby avoid or reduce said color mixture effect.
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Specification