Display drive circuit

An apparatus comprising:

• an interface operable to receive, from an external host processor, an image data write command and image data;
• a memory configured to store a frame of the image data responsive to the image data write command;
• parameter generation circuitry operable to generate an image data-conversion parameter based on a brightness distribution of the frame of the image data;
• image data conversion circuitry operable to convert the image data based on the image data-conversion parameter;
• source driver circuitry operable to drive source electrodes of a display with source signals that are based on the converted image data;
• detection circuitry operable to:
• detect whether the image data write command is received;
• and
• generate, responsive to detecting an absence of the image data write command, a detection signal with a first value indicating that there is no change between the frame and a preceding frame of the image data;
• and
• clock control circuitry configured to:
• stop supplying a first clock signal to the parameter generation circuitry during a first period in response to the first value of the detection signal;
• and
• supply a second clock signal to backlight control circuitry during the first period,
• wherein the parameter generation circuitry is configured to stop generating the image data-conversion parameter responsive to the clock control circuitry stopping the supply of the first clock signal.

A method of operating a display driver, the method comprising:

• receiving, from an external host processor, image data comprising a first frame;
• responsive to an image data write command from the external host processor, storing the first frame in a memory of the display driver;
• generating a conversion parameter based on a brightness distribution of the first frame;
• converting the image data based on the conversion parameter;
• driving source electrodes of a display with source signals based on the converted image data;
• responsive to determining that the image data write command is not received within a predefined period of one frame or longer, generating a detection signal with a first value indicating that there is no change between the first frame and a subsequent second frame of the image data;
• responsive to the first value of the detection signal, stopping supplying a first clock signal to parameter generation circuitry during a first period;
• supplying, during the first period, a second clock signal to a blacklight control circuitry;
• and
• responsive to stopping supplying the first clock signal, transmitting a control signal to thereby stop generating the conversion parameter.