PXD20RM Datasheet, PDF (436/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

0x0800
RED
Blended
pixel
0x0C00
GREEN
0x1000
BLUE
Gamma
adjusted
pixel
Figure 11-83. Gamma Correction Table Organization
The gamma table can only be read or written when the DCU3 is not enabled or during the vertical blanking
period.
11.4.8 Temporal dithering
This is a technique that allows the emulation of a color resolution higher than the resolution supported by
the display. It is done by changing the intensity values over time sent to the display. The averaging done
by the human eye gives the impression of the intensity of such alternating pixels as an interim value
between the two supported intensity values. Temporal dithering is enabled by the
DCU_MODE[DITHER_EN] bit.
The key features of the dithering block are
• Temporal dithering increases the optically perceived depth of a limited TFT display
• Supports display with 5-8 bits resolution per color component
• Independent dither control parameters per color component
• Support for safety mode
Temporal dithering is enabled and controlled by the EN_DITHER, ADDB, ADDG, and ADDR bits in the
DCU_MODE register. The ADDx fields are each 2 bits wide and select how many bits to add to each color
component. The typical setting is 8 minus the number of bits in each component required by the display.
11-102
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor