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I don't think RGBG has ever been used on an LCD, only OLED. The few pentile LCDs that motorola used briefly were RGBW. LCDs are almost universally RGB displays.
Green and yellow (found in sepia) are notable for not using the blue light, which induces eye strain in some and can disrupt sleep. Red is less commonly used because while it has no negative physiological consequences, it does have unrelaxing psychological connections. I'm fairly certain that's the rationale for this new green option, even if this particular implementation sounds odd. This one would be for people who don't like yellow (I've heard a number of folks complain about their backlight kindles being too warm and yellowish, though I'd be thrilled to get a super warm one).
I'd also be tickled pink if kindle software offered a green foreground on black background option. My very first grayscale PDA, which was also my first ereader using peanut press/palmdigitalmedia/ereader.com, had a greenish backlight that only illuminated the foreground. In a reader, that meant only the lettering glowed. It was delightful. I've worked to get that scheme on every LCD I've had since, but of course I've to use 3rd party software.
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