In Micro-OLED, colors are produced by mixing R, G, B sub-pixels. Different proportions of these lights create various colors like white. Each sub-pixel must emit light with a precise intensity for accurate macroscopic color presentation.
However, the current for each pixel, especially low-luminance ones, is extremely small. Tiny current differences between adjacent low-luminance pixels are magnified, which may reduce the color gamut in the low-gray-scale area.
Analog driving controls pixel luminance by changing input current or voltage. Ideally, precise adjustment can control sub-pixel light intensity and mix accurate colors. But in practice, small current differences in low-luminance pixels cause inaccurate sub-pixel light intensity and color deviation. For example, in the dark area, a current deviation in the blue sub - pixel can distort the mixed color, reducing the color gamut.
Digital driving controls luminance by adjusting the on-off time ratio of pixels. For low-luminance pixels, it can achieve the desired effect by setting a shorter on-time and a longer off-time without relying on current difference distinction. This also applies to sub-pixels, enabling precise color mixing according to the R, G, B proportion, ensuring color authenticity and an unchanged full-gray-scale color gamut.
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