Method for controlling operations of RGBW display based on human factor

摘要

A method for controlling a display is provided. An RGB video signal is transformed into an RGBW video signal based on a human factor. The display has a plurality of pixels configured to display images according to the RGBW video signal, where each of the pixels has a red subpixel, a green subpixel, a blue subpixel and a white subpixel. According to the method, when brightness of a backlight module of the display is reduced to decrease energy consumption of the display, quality of the images of the display observed by users is still maintained within an acceptable range.

主权项

1. A method for controlling operations of a display based on a human factor, the method comprising:
a driving circuit of the display receiving an image signal of a group of pixels, the group of pixel comprising a plurality of pixels, and each of the pixels comprising a red subpixel, a green subpixel, a blue subpixel and a white subpixel; a gamma transformation unit of the driving circuit respectively transforming a red data value, a green data value and a blue data value of each of the pixels into a red brightness value, a green brightness value and a blue brightness value of the each of the pixels; a maximum selection unit of the driving circuit setting a maximum of the red brightness values, the green brightness values and the blue brightness values of the pixels as a maximum brightness value, and a minimum selection unit of the driving circuit setting a minimum of the red brightness values, the green brightness values and the blue brightness values of the pixels as a minimum brightness value; a saturation determining unit of the driving circuit obtaining a saturation value according to the maximum brightness value and the minimum brightness value; a boundary brightness determining unit of the driving circuit transforming the saturation value into a boundary brightness value according to the human factor; a mapping ratio determining unit of the driving circuit obtaining a mapping ratio according to the boundary brightness value and the maximum brightness value; three multipliers of the driving circuit respectively multiplying the red brightness value, the green brightness value and the blue brightness value of each of the pixels by the mapping ratio to obtain a red mapping brightness value, a green mapping brightness value and a blue mapping brightness value of the each of the pixels; a divider of the driving circuit dividing a minimum of the red mapping brightness value, the green mapping brightness value and the blue mapping brightness value of the each of the pixels by an adjustment parameter to obtain a white transformation brightness value of the each of the pixels; three subtractors of the driving circuit respectively subtracting the white transformation brightness value of the each of the pixels from the red mapping brightness value, the green mapping brightness value and the blue mapping brightness value of the each of the pixels to obtain a red transformation brightness value, a green transformation brightness value and a blue transformation brightness value of the each of the pixels; a threshold unit of the driving circuit obtaining a red output brightness value, a green output brightness value, a blue output brightness value and a white output brightness value of the each of the pixels by respectively determining whether the red transformation brightness value, the green transformation brightness value, the blue transformation brightness value and the white transformation brightness value of the each of the pixels are greater than a threshold; a gray-level transformation unit of the driving circuit respectively transforming the red output brightness value, the green output brightness value, the blue output brightness value and the white output brightness value of the each of the pixels into a red output data value, a green output data value, a blue output data value and a white output data value of the each of the pixels; and the display respectively controlling brightness of the red subpixel, the green subpixel, the blue subpixel and the white subpixel of the each of the pixels according to the red output data value, the green output data value, the blue output data value and the white output data value of the each of the pixels; wherein a brightness of the display is a first primary color brightness when the display displays a pure red image, the brightness of the display is a pure white brightness when the display displays a pure white image, and a ratio of the first primary color brightness to the pure white brightness is between 0.14 to 0.16.