Current limiting circuit, display device, and current limiting method

A current limiting method for limiting a current supplied to a plurality of pixels included in a display panel, which displays a video based on a video signal, to control a power consumption value in the plurality of pixels to be less than or equal to a control target power value, each of the plurality of pixels including a plurality of sub-pixels, each of the plurality of sub-pixels including a self-light-emitting element, wherein

• the current limiting method comprises:
• power calculation for calculating a screen power value related to the power consumption value based on pixel values of the video signal respectively corresponding to the plurality of sub-pixels;
• gain calculation for calculating a gain based on the screen power value;
• and
• gain multiplication for multiplying the pixel values respectively corresponding to the plurality of sub-pixels by the gain,
• in the power calculation, when a maximum value of the pixel values respectively corresponding to the plurality of sub-pixels in each of the plurality of pixels exceeds a first threshold value, instead of the pixel values respectively corresponding to the plurality of sub-pixels, a common pixel value greater than or equal to the maximum value is used to calculate the screen power value, and
• in the gain calculation, when the screen power value exceeds the control target power value, the gain is set to a ratio of the control target power value with respect to the screen power value, and when the screen power value is less than or equal to the control target power value, the gain is set to 1.

A current limiting circuit which limits a current supplied to a plurality of pixels included in a display panel, which displays a video based on a video signal, to control a power consumption value in the plurality of pixels to be less than or equal to a control target power value, each of the plurality of pixels including a self-light-emitting element, wherein

• the current limiting circuit comprises:
• a gain determination circuit which calculates a screen power value related to the power consumption value based on pixel values of the video signal respectively corresponding to the plurality of pixels and determines a gain based on the screen power value;
• and
• a gain multiplication circuit which multiplies the pixel values respectively corresponding to the plurality of pixels by the gain,
• where the screen power value provided when a current corresponding to an upper limit value of the pixel values respectively corresponding to the plurality of pixels is supplied is defined as a rated power value, a ratio of the screen power value with respect to the rated power value is defined as a screen power ratio, and a ratio of the control target power value with respect to the rated power value is defined as a target power ratio,
• the gain determined by the gain determination circuit is 1 when the screen power ratio is less than or equal to a first power ratio less than the target power ratio,
• the gain monotonously decreases with respect to the screen power ratio when the screen power ratio is greater than the first power ratio and less than or equal to 100%,
• the gain is a value less than a value obtained by dividing the target power ratio by the screen power ratio when the screen power ratio is greater than or equal to the target power ratio and less than 100%, and
• the gain is the target power ratio when the screen power ratio is 100%.

A current limiting method for limiting a current supplied to a plurality of pixels included in a display panel, which displays a video based on a video signal, to control a power consumption value in the plurality of pixels to be less than or equal to a control target power value, each of the plurality of pixels including a self-light-emitting element, wherein

• the current limiting method comprises:
• power calculation for calculating a screen power value related to the power consumption value based on pixel values of the video signal respectively corresponding to the plurality of pixels;
• gain determination for determining a gain based on the screen power value;
• and
• gain multiplication for multiplying the pixel values respectively corresponding to the plurality of pixels by the gain,
• where the screen power value provided when a current corresponding to an upper limit value of the pixel values respectively corresponding to the plurality of pixels is defined as a rated power value, a ratio of the screen power value with respect to the rated power value is defined as a screen power ratio, and a ratio of the control target power value with respect to the rated power value is defined as a target power ratio,
• the gain determined in the gain determination is 1 when the screen power ratio is less than or equal to a first power ratio less than the target power ratio,
• the gain monotonously decreases with respect to the screen power ratio when the screen power ratio is greater than the first power ratio and less than or equal to 100%,
• the gain is a value less than a value obtained by dividing the target power ratio by the screen power ratio when the screen power ratio is greater than or equal to the target power ratio and less than 100%, and
• the gain is the target power ratio when the screen power ratio is 100%.