Figure 4-2. Block Diagram Of A Typical Advanced Lcd Panel; Lcd Panel Architecture - Sharp LH79524 User Manual

Color Liquid Crystal Display Controller

4.1.1 LCD Panel Architecture

Modern technology panels, including AD-TFT and HR-TFT panels, are thinner than ever.
To achieve maximum space savings, they are manufactured without the large ASICs and
DC-DC converter blocks built into STN and TFT panels. See Figure 4-2.
The ASIC in STN and TFT panels decodes input data into Row and Column information
and builds the timing signals. It supplies this information to the panel's Row and Column
driver chips to set the proper pixels at the proper intensity and at the proper times. The
DC-DC converter runs the panel's power supplies and illuminator. Including these devices
in STN and TFT panels, however, comes at the cost of bulk and weight.
The ALI eliminates the need for a separate Timing ASIC, since it is able to drive the panel's
Row and Column driver chips directly. The DC-DC conversion is also handled off-panel,
by a separate device operating the panel's high voltage supplies and illuminator. The
DC-DC conversion must be handled by a separate device, since the LH79524/LH79525
do not supply this function.
Unless the behavior is different, this User's Guide uses the term TFT to discuss all types
of TFT panels whether the panel requires timing support from the ALI or not.
DISPLAY
SIGNALS
4-2
TIMING
ASIC
DC/DC
CONVERTER

Figure 4-2. Block Diagram of a Typical Advanced LCD Panel

Version 1.0
LH79524/LH79525 User's Guide
LCD PANEL ASSEMBLY
ROW TIMING
LCD
PANEL
GLASS
79525-48