DS90UH948-Q1 Datasheet, PDF (44/91 Pages) Texas Instruments – FPD-Link III to OpenLDI Deserializer

DS90UH948-Q1
SNLS473A – OCTOBER 2014 – REVISED JANUARY 2016
www.ti.com
CLK1 +/-
(Differential)
D0 +/-
D1 +/-
D2 +/-
Previous cycle
G10
R15
Current cycle
R14
R13
R12
R11
B11
B10
G15
G14
G13
G12
R10
G11
DE
VS
HS
B15
B14
B13
B12
D3~D7 +/-
Figure 39. 18-bit Color Single FPD-Link Mapping (MAPSEL=L)
8.5 Image Enhancement Features
Several image enhancement features are provided. The White Balance LUTs allow the user to define and map
the color profile of the display. Adaptive Hi-FRC Dithering enables the presentation of 'true color' images on an
18-bit display.
8.5.1 White Balance
The White Balance feature enables similar display appearance when using LCD’s from different vendors. It
compensates for native color temperature of the display, and adjusts relative intensities of R, G, and B to
maintain specified color temperature. Programmable control registers are used to define the contents of three
LUTs (8-bit color value for Red, Green and Blue) for the White Balance Feature. The LUTs map input RGB
values to new output RGB values. There are three LUTs, one LUT for each color. Each LUT contains 256
entries, 8-bits per entry with a total size of 6144 bits (3 x 256 x 8). All entries are readable and writable.
Calibrated values are loaded into registers through the I2C interface (deserializer is a slave device). This feature
may also be applied to lower color depth applications such as 18–bit (666) and 16–bit (565). White balance is
enabled and configured via serial control bus register.
8.5.2 LUT Contents
The user must define and load the contents of the LUT for each color (R,G,B). Regardless of the color depth
being driven (888, 666, 656), the user must always provide contents for 3 complete LUTs - 256 colors x 8 bits x 3
tables. Unused bits - LSBs -shall be set to “0” by the user.
When 24-bit (888) input data is being driven to a 24-bit display, each LUT (R, G and B) must contain 256 unique
8-bit entries. The 8-bit white balanced data is then available at the output of the deserializer, and driven to the
display.
The user must define and load the contents of the LUT for each color (R,G,B). Regardless of the color depth
being driven (888, 666, 656), the user must always provide contents for 3 complete LUTs - 256 colors x 8 bits x 3
tables. Unused bits - LSBs -shall be set to “0” by the user. When 24-bit (888) input data is being driven to a 24-
bit display, each LUT (R, G and B) must contain 256 unique 8-bit entries. The 8-bit white balanced data is then
available at the output of the deserializer, and driven to the display.
Alternatively, with 6-bit input data the user may choose to load complete 8-bit values into each LUT. This mode
of operation provides the user with finer resolution at the LUT output to more closely achieve the desired white
point of the calibrated display. Although 8-bit data is loaded, only 64 unique 8-bit white balance output values are
available for each color (R, G and B). The result is 8-bit white balanced data. Before driving to the output of the
deserializer, the 8-bit data must be reduced to 6-bit with an FRC dithering function. To operate in this mode, the
user must configure the deserializer to enable the FRC2 function.
Examples of the three types of LUT configurations described are shown in Figure 40.
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