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Japan
Graphic Buffer IC
The buffer IC is a device installed between the graphics engine and the LCD driver IC; it makes it possible to reduce the power consumption and cost of the entire display system. An 8-Mbit internal frame buffer can support a 24-bit VGA screen.
The buffer IC also includes a simple image processing function. Through use of the high-speed serial interface M-CMADS 3000, the system can deliver stable video data to an LCD module.
Main Features of the Graphics Buffer IC
• Frame buffer memory installed (25-bit VGA compatible)
• CPU and RGB interface support on the input side
• Display control function through SPI and CPU interface
• Image-processing function (image rotation, portrait/landscape change over)
• Delivery of stable video data through a high-speed serial interface (M-CMADS 3000)
• 32.768 kHz or 19.2MHz external clock input
• 1.8-V single power supply
• Operating consumption current less than 48 MW
This is the typical consumption current for reception of a 24-bit VGA image at 30 fps and transmission of the same image at 60 fps to an LCD module
• 64-pin FPBGA package (5 mm⟨)
Comparison of Sample LCD Interface Configurations Employing Graphics Buffer IC
A conventional graphics engine that is not equipped with a high-speed interface has the following demerits.
Conventional LCD Interface Configuration (1)
Configuration Requiring Constant Refreshing of the LCD Screen by the Graphics Engine
In a configuration in which streaming images are rendered as simplified images whilst on standby, the graphics engine suffers a heavy burden due to its constant refreshing of the LCD, and the system consumes a great amount of power.
Conventional LCD Interface Configuration (2)
Configuration in which the LCD driver IC uses a frame buffer
Because the graphics engine transfers commands/data in parallel with the LCD driver IC, this system is inefficient.
Also, LCD drivers containing frame buffers for supporting high-resolution images such as VGA have not yet been popularized.
Sample Application of Graphics Buffer IC
Capable of low-cost image processing
Low power consumption during operation
Image display stabilization via M-CMADS3000
