GM5115 Datasheet, PDF (39/58 Pages) List of Unclassifed Manufacturers – ONPANEL LCD PANEL CONTROLLER

*** Genesis Microchip Confidential ***
TMG1 TMG2
PPWR Output
Panel Data and Control Signals
PBIAS Output
gm5115/25 Preliminary Data Sheet
TMG2 TMG1
<State0>
<State1> <State2>
<State3>
<State2> <State1> <State0>
POWER_SEQ_EN = 1
POWER_SEQ_EN = 0
Figure 22.
Panel Power Sequencing
4.11.4 Output Dithering
The Gamma LUT outputs a 10-bit value for each color channel. This value is dithered down to
either 8-bits for 24-bit per pixel panels, or 6-bits for 18-bit per pixel panels.
The benefit of dithering is that the eye tends to average neighboring pixels and a smooth image
free of contours is perceived. Dithering works by spreading the quantization error over
neighboring pixels both spatially and temporally. Two dithering algorithms are available: random
or ordered dithering. Ordered dithering is recommended when driving a 6-bit panel.
All gray scales are available on the panel output whether using 8-bit panel (dithering from 10 to 8
bits per pixel) or using 6-bit panel (dithering from 10 down to 6 bits per pixel).
4.12 Energy Spectrum Management (ESM)
High spikes in the electromagnetic interference (EMI) power spectrum can cause LCD monitor
products to violate emissions standards. The gm5115/25 programmable TCON has many features
that can be used to reduce EMI. These include:
• transition minimization,
• drive strength control,
• data staggering,
• even/odd, red/blue, bit 0/7 swapping for reduced trace length,
• slew rate control,
• dual-edge clocking, and
• clock spectrum modulation.
These features eliminate the costs associated with EMI-reducing components and shielding.
June 2002
30
C5115-DAT-01H