HD66781 Datasheet, PDF (179/196 Pages) Renesas Technology Corp – 720-channel Source Driver for a-Si TFT/Low Temperature Poly-Si TFT Panels with 262,144-color display RAM

HD66781
Preliminary
Partial Display Function
The HD66781 enables arbitrary settings for on-display picture RAM area and the display position on the
screen with the use of OSD. When the display of base image is turned off (BASEE=0), OSD is displayed
100%.
By making settings for OSD RAM area (OSA, OEA) and OSD position (ODP), the HD66781 allows
displaying an arbitrary set of data. Other than OSD area becomes no-display area to reduce power
consumption.
The partial display area using OSD can be made up to 3 areas.
In combination with 8-color mode and off-scan settings (PTS, PTG, ISC), more power-saving display will
be obtained. Make an appropriate setting taking power-saving effect and display quality into consideration.
G41
G59
Non-display area
First OSD image : 19 raster-rows
Non-display area
Number of driving raster-row
Base picture display ENABLE
First OSD picture display RAM area
First OSD picture display position
First OSD picture display ENABLE
: NL0 =6’h07 (64 raster-rows)
: BASEE = 0
: (OSA0, OEA0) = (8’h000, 8’h013)
: ODP0=8’h028
: OSDE=1
Partial Display
Note 1) See the “RAM Address and Display Position on the Panel” for more details on the relationship
between the display area and the setting of RAM area.
Rev.0.5, July.31.2003, page 179 of 196