SD1010D Datasheet, PDF (14/40 Pages) List of Unclassifed Manufacturers – Digital Interface VGA TFT LCD Display Controller

displayed to the full screen regardless the input mode. The SD1010D scales the images in both
horizontal and vertical directions. It calculates the correct scaling ratio for both directions based
upon the LCD panel resolution and the input mode and timing information produced by the
“Input mode detection” block. The scaling ratio is re-adjusted whenever a different input mode
is detected. The ratio is then fed to the buffer memory read control logic to fetch the image data
with the right sequence and timing. Some of the image data may be read more than once to
achieve the scaling effect.
v)
Image interpolation
The SD1010D supports image interpolation to achieve better image quality. A basic image
scaling algorithm replicates the input images to achieve the scaling effect. The replication
scheme usually results in a poor image quality. The SD1010D implements a proprietary
interpolation algorithm to improve the image quality. The programmable interpolation is
implemented with a 256-entry mapping table in the EEPROM to allow system users to adjust
the bi-linear interpolation parameters to control the sharpness and smoothness quality of the
image. In the default setting, the mapping table contains a straight line of slope equal to 1, i.e.
the data in entry N equal to the value N. If the mapping table contains a line of slope equal to 2,
then the output image will be a bit sharper than the image generated by a table with the default
setting. Through an external microcontroller, users can chose among different interpolation
algorithm.
vi)
Dithering
The SD1010D supports 16.7 million true colors for a 6-bit panel. Two dithering algorithms are
implemented and users can chose between them through the external microcontroller. The first
one is area-based dithering, and the second one is a frame-based frame modulation, which also
is called frame rate control. Through the external microcontroller, users can choose among
different dithering algorithms.
vii) Text Enhancement
In order to generate a good picture, the SD1010D incorporate a proprietary scheme to detect
text and non-text picture. Then applying the appropriate process to improve the text image
based on the detection of incoming source. By using the text enhancement function correctly,
the text image will look more pleasant and near perfect after scaled up or down. Users can
achieve a preferred image by changing the settings in “text control” register.
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