SD1010-1199A N/A, SD1010-1199A Datasheet - Page 17

• Manufacturer Part Number: SD1010-1199A
• Description: Analog-Interface XGA TFT LCD Display Controller
• Manufacturer: N/A

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.
3.3.5.
No matter how many times the original image got enlarged or shrunk by the internal
interpolator. With the embedded powerful DSP arrays, SD1010A always can enhance
the overall image sharpness (edge) to different degree for the various requirements.
The sharpness can be adjusted bi-directionally which means either going sharper or
softer to certain point set by the user. It’s easy to activate the sharpness enhancement
by program “sharpness control” register.
3.4.
At the output stage, the SD1010A performs the OSD mixer function, and then
generates the 24-bit / 48-bit RGB signal to the LCD panel with the correct timing.
3.4.1.
In the OSD mixer block, the SD1010A mixes the normal output RGB signal with the
OSD signal. The OSD output data is generated based on the “R_OSD”, “G_OSD” and
“B_OSD” pins as well as the “OSD Intensity” data in EEPROM entry. When the
“EN_OSD” is active high, the OSD is active, and the SD1010A will send the OSD
data to the LCD panel. The OSD has 16 different color schemes based on the
combinations of the three OSD color pins and the “OSD Intensity” data. When
R_OSD=1, and OSD_Intensity=0, the SD1010A will output 128 to the output red
channel, R_OUT. When R_OSD=1 and OSD_Intensity=1, the SD1010A will output
255. The same scheme is used for G_OSD to G_OUT and for B_OSD to B_OUT.
As part of the mixer control function, the SD1010A implements three mixing control
registers, “OSD R Weight” (38H), “OSD G Weight”(39H), and “OSD B Weight”
(3AH). The mixing equation is shown below:
When the weight is 255, the OSD output will overlay on top of the normal output.
When the weight is 0, the OSD output is disabled.
November, 1999
Revision B
SmartASIC, Inc.
R_OUT = (R_OSD) * (OSD R Weight/255) + R * (1 - OSD R Weight/255)
G_OUT = (G_OSD) * (OSD G Weight/255) + G * (1 - OSD G Weight/255)
B_OUT = (B_OSD) * (OSD B Weight/255) + B * (1 - OSD B Weight/255)
OSD mixer and LCD interface
Sharpness Enhancement
OSD mixer
SmartASIC Confidential
SD1010A
17