Abstract: A controller/driver is composed of a work memory, a graphic engine, a display memory, and a driver circuit. The graphic engine converts externally received image data into first bitmap data, and stores the first bitmap data in the work memory. The display memory receives and stores second bitmap data developed from the first bitmap data stored in the work memory. The driver circuit drives a display panel in response to the second bitmap data received from the display memory.

Abstract: An image memory is composed of a memory cell array, first and second area selecting circuits, and a write circuit. The memory cell array includes memory elements arrayed in rows and columns, each of the memory elements being adapted to store pixel data. The first area selecting circuit is adapted to select a plurality of row addresses at the same time, and the second area selecting circuit is adapted to select a plurality of column addresses at the same time. The write circuit is adapted to write same pixel data into selected memory elements out of the memory elements, the selected memory elements being associated with the selected row addresses and column addresses.

Abstract: A controller driver includes a color palette circuit configured to hold color palette data indicating a relation of a color reference numbers corresponding to a color and RGB data corresponding to the color, a first memory section configured to hold first layer data containing first RGB data specifying a color of each of pixels of a first layer image; a second memory section configured to hold second layer data containing a color reference number specifying a color of each of pixels of a second layer image; a calculating circuit configured to generate synthetic image data of the first layer data and the second layer data; and a driving circuit configured to drive a display panel based on the synthetic image data.

Abstract: A controller driver includes a driving process circuit configured to receive background bit map data of a background image and font data for a character image, and a font drawing circuit configured to generate pixel data of the character image from the font data. The font data for a pixel is described in a format in which a bit length of the font data for the pixel shorter than in a RGB format, and the driving processing circuit displays on a display panel a synthetic image in which the character image is superimposed on the background image in an on-screen display mode, by driving the display panel based on the background bit map data and the pixel data of the character image.

Abstract: A display memory circuit includes a drawing memory and a dynamic display memory. The drawing memory stores data and at least a portion of the data are possibly rewritten into a new data at a third timing, the third timing being optional between a first timing and a second timing. The dynamic display memory is connected with the drawing memory, which latches the data in response to the first timing and continues to hold the data between the first timing and the second timing. The drawing memory is partially disconnected from the dynamic display memory in the rewritten portion when the portion is rewritten in the drawing memory.

Abstract: A controller-driver, a method of driving the controller-driver, and a method of processing image data enabling scroll or other various functions without adding a storage capacity of a display memory nor increasing power consumption. A built-in display memory having a capacity of one frame (H pixels×V pixels×the number of bits) is partitioned into a plurality of memories according to an image type. High order bits are then stored in a first display memory 7a and high order bits of the next frame or low order bits are stored in a second display memory 7b by using a first selector 8 to a third selector 10 controlled by a memory control circuit 6 before they are read out. Thereby, high-level image data of one frame can be displayed when the scroll function is not used and image data of a plurality of frames can be displayed without accessing an image drawing unit 1 when the scroll function is used, thereby reducing power consumption.

Abstract: A controller/driver is composed of a work memory, a graphic engine, a display memory, and a driver circuit. The graphic engine converts externally received image data into first bitmap data, and stores the first bitmap data in the work memory. The display memory receives and stores second bitmap data developed from the first bitmap data stored in the work memory. The driver circuit drives a display panel in response to the second bitmap data received from the display memory.

Abstract: A controller driver includes a color palette circuit configured to hold color palette data indicating a relation of a color reference numbers corresponding to a color and RGB data corresponding to the color, a first memory section configured to hold first layer data containing first RGB data specifying a color of each of pixels of a first layer image; a second memory section configured to hold second layer data containing a color reference number specifying a color of each of pixels of a second layer image; a calculating circuit configured to generate synthetic image data of the first layer data and the second layer data; and a driving circuit configured to drive a display panel based on the synthetic image data.

Abstract: An image memory is composed of a memory cell array, first and second area selecting circuits, and a write circuit. The memory cell array includes memory elements arrayed in rows and columns, each of the memory elements being adapted to store pixel data. The first area selecting circuit is adapted to select a plurality of row addresses at the same time, and the second area selecting circuit is adapted to select a plurality of column addresses at the same time. The write circuit is adapted to write same pixel data into selected memory elements out of the memory elements, the selected memory elements being associated with the selected row addresses and column addresses.

Abstract: A controller driver includes a driving process circuit configured to receive background bit map data of a background image and font data for a character image, and a font drawing circuit configured to generate pixel data of the character image from the font data. The font data for a pixel is described in a format in which a bit length of the font data for the pixel shorter than in a RGB format, and the driving processing circuit displays on a display panel a synthetic image in which the character image is superimposed on the background image in an on-screen display mode, by driving the display panel based on the background bit map data and the pixel data of the character image.

Abstract: A display memory circuit includes a drawing memory and a dynamic display memory. The drawing memory stores data and at least a portion of the data are possibly rewritten into a new data at a third timing, the third timing being optional between a first timing and a second timing. The dynamic display memory is connected with the drawing memory, which latches the data in response to the first timing and continues to hold the data between the first timing and the second timing. The drawing memory is partially disconnected from the dynamic display memory in the rewritten portion when the portion is rewritten in the drawing memory.

Abstract: A controller-driver, a method of driving the controller-driver, and a method of processing image data enabling scroll or other various functions without adding a storage capacity of a display memory nor increasing power consumption. A built-in display memory having a capacity of one frame (H pixels×V pixels×the number of bits) is partitioned into a plurality of memories according to an image type. High order bits are then stored in a first display memory 7a and high order bits of the next frame or low order bits are stored in a second display memory 7b by using a first selector 8 to a third selector 10 controlled by a memory control circuit 6 before they are read out. Thereby, high-level image data of one frame can be displayed when the scroll function is not used and image data of a plurality of frames can be displayed without accessing an image drawing unit 1 when the scroll function is used, thereby reducing power consumption.