| 摘要 |
A display device includes a display panel having pixels each constituted by red, green, blue, and white subpixels and a backlight, further including: a grayscale ratio calculating section acquiring RGB data and calculating a ratio of the lowest to the highest of RGB grayscales in each pixel; a detection section detecting, from the RGB data, a ratio of the number of target pixels in one frame; a conversion coefficient calculating section acquiring, by using the detected ratio, a conversion coefficient for converting the RGB data into RGBW data; a RGB data conversion section converting the RGB data into the RGBW data per pixel by using the conversion coefficient; and a display control section generating, from the RGBW data, an image to be displayed on the display panel and causing the display panel to display the image. |
| 主权项 |
1. A display device, comprising:
a display panel having pixels each constituted by subpixels of red (R), green (G), blue (B), and white (W); a backlight configured to emit light to the display panel; and control circuitry configured to
acquire RGB data and calculate a grayscale ratio of a lowest grayscale to a highest grayscale of RGB grayscales in each pixel which are indicated by the acquired RGB data,determine that a pixel, which has the calculated grayscale ratio not more than a predetermined value, is a target pixel to be detected, and detect, from the RGB data, a ratio of a number of target pixels in one frame,acquire, by using the ratio of the number of the target pixels in one frame, a conversion coefficient for converting the RGB data into RGBW data,convert the RGB data into the RGBW data with respect to each pixel by using the conversion coefficient, andgenerate, from the RGBW data to which the RGB data has been converted, an image to be displayed on the display panel, and cause the display panel to display the image, wherein the control circuitry is configured to acquire the conversion coefficient by using a curve indicative of a relation between the calculated grayscale ratio and the conversion coefficient, wherein
as the ratio of the number of the target pixels in one frame is larger, the curve used for acquiring the conversion coefficient has a smaller inclination, andas the ratio of the number of the target pixels in one frame is smaller, the curve used for acquiring the conversion coefficient has a larger inclination, and the control circuitry is further configured to
count a number of pixels specified to display with RGB grayscales one of which exceeds a maximum grayscale in RGBW data to which RGB data has been converted in a previous frame, anddetermine whether a ratio of the number of the specified pixels to the number of all pixels is more than a predetermined upper limit or less than a predetermined lower limit, whereinwhen the ratio of the number of the specified pixels to the number of all pixels is more than the predetermined upper limit, the curve used for acquiring the conversion coefficient is shifted in a y-axis upward direction, andwhen the ratio of the number of the specified pixels to the number of all pixels is less than the predetermined lower limit, the curve used for acquiring the conversion coefficient is shifted in a y-axis downward direction. |
