RGB to RGBW brightness compensation method and device

An RGB to RGBW brightness compensation method, characterized in that, the method comprises:

• retrieving multiple gray scale values of RGB color RGB(x, y, z), wherein x is a gray scale level of a red sub-pixel of an RGB model, y is a gray scale level of a green sub-pixel of an RGB model and z is a gray scale level of a blue sub-pixel of an RGB model 0≤x, y, z≤1;
• multiplying the gray scale values of RGB color RGB (x, y, z) by N to obtain multiple enhanced gray scale values of RGB color RGB (Nx, Ny, Nz), wherein N is 1≤N≤ 4/3 and a minimum value selected from x, y, z is taken to represent a first conversion value W1;
• and
• obtaining multiple gray scale values of RGBW color RGBW (Nx−W1, Ny−W1, Nz−W1, W1) according to the enhanced gray scale values of RGB color RGB (Nx, Ny, Nz) and the first conversion value W1;
• wherein the method further comprises a step of determining whether one or more than one of Nx−W1, Ny−W1 and Nz−W1 is larger than 1;
• and
• if not, outputting the gray scale values of RGBW color RGBW (Nx−W1, Ny−W1, Nz−W1, W1);
• and if yes, taking a minimum value selected from Nx−W1, Ny−W1 and Nz−W1, to represent a second conversion value W2 and making the gray scale values of RGBW color to be RGBW (Nx−W1−W2, Ny−W1−W2, Nz−W1−W2, W1+W2).

An RGB to RGBW brightness compensation device, characterized in that, the device comprises:

• a retrieving module, an enhancing module, a module of obtaining conversion value and a module of obtaining gray scale values of RGBW color;
• wherein:
• the retrieving module is used to retrieve multiple gray scale values of RGB color RGB (x, y, z), wherein x is a gray scale level of a red sub-pixel of an RGB model, y is a gray scale level of a green sub-pixel of an RGB model and z is a gray scale level of a blue sub-pixel of an RGB model 0≤x, y, z≤1;
• the enhancing module is used to multiply the gray scale values of RGB color RGB (x, y, z) by N to obtain multiple enhanced gray scale values of RGB color RGB (Nx, Ny, Nz), wherein 1<N≤ 4/3;
• the module of obtaining conversion value is used to make a minimum value selected from x, y, z to represent a first conversion value W1;
• and
• the module of obtaining gray scale values of RGBW color is used to retrieve multiple gray scale values of RGBW color RGBW (Nx−W1, Ny−W1, Nz−W1, W1), according to the enhanced gray scale values of RGB color RGB (Nx, Ny, Nz) and the first conversion value W1;
• the device further comprises:
• a first determining module and an output module;
• wherein:
• the first determining module is used to determine whether one or more than one of Nx−W1, Ny−W1 and Nz−W1 is larger than 1;
• and
• when one or more than one value is not larger than 1, the output module outputs the gray scale values of RGBW color RGBW (Nx−W1, Ny−W1, Nz−W1, W1), and when one or more than one value is larger than 1, the output module makes a minimum value selected from Nx−W1, Ny−W1 and Nz−W1 taken to represent a second conversion value W2, and outputs that the gray scale values of RGBW color are RGBW (Nx−W1−W2, Ny−W1−W2, Nz−W1−W2, W1+W2).