HD66781 Datasheet, PDF (169/196 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
Low Power Consumption Display Mode
Setting COL[1:0] to 2’h1 halts 32 amplifiers among V0 ~ V63 grayscale amplifiers to display with low
power consumption. In combination with the FRC mode setting, it is possible to realize display with low
power consumption in abundant colors.
To make a setting for the low power consumption display, set in accordance to the following table
according to the interface in use. The setting must be made in accordance to the setting sequence for low
power consumption display mode.
Using this mode with short screen refreshing cycle may affect the quality of display. Consider the trade-off
between the display quality and power-saving effects before use.
Table 71
Interface mode
FRCON
D16B
Available colors
18 bit, 16 bit x2, 9 bit x2,
0
8 bit x3, RGB18bit, 6 bit x3
1
*
262,144
0
250,047
16bit x1, 8 bit x2, SPI
0
*
65,536
1
1
64,512
Note 1) When the FRC mode is on, do not switch the interface mode settings (M, TRI, D16B registers)
Note 2) When the FRC mode is on, 18-bit format data and 16-bit format data are not displayed
simultaneously.
Table 72
COL[1:0] Amplifiers in operation Available colors for display
FRCON = 0
FRCON = 1
2’h0
64
262,144 colors/65,536 colors
-
2’h1
32
32,768 colors
250,047 colors/64,512 colors
2’h2
2
8 colors
-
2’h3
Setting disabled
Setting disabled
Setting disabled
Note 1) When COL[1:0] =2’h1 and FRCON = 0, do not write data that correspond to the grayscale levels for
which the amplifiers are halted.
Rev.0.5, July.31.2003, page 169 of 196