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Chapter 4
Color Liquid Crystal
Display Controller
This chapter discusses the Color LCD Controller (CLCDC) and its Advanced LCD Interface
Peripheral (ALI) for AD-TFT, HR-TFT panels, and any technology of panel compatible with
this signal system. The ALI-specific description begins in Section 4.4. The only difference
between the LH79524 CLCDC and the LH79525 CLCDC is the pixel bit depth. The LH79524
supports up to 16 bits-per-pixel (bpp) depth, and the LH79525 supports up to 12 bpp.
4.1 Introduction
The CLCDC provides all necessary control and data signals to interface the SoC directly
to a variety of color and monochrome LCD panels, including STN and TFT panels. The ALI
modifies the CLCDC output to allow the chip to connect directly to the Row and Column
driver chips on superthin panels, including AD-TFT, HR-TFT, or any panel that supports
this method of connection. Figure 4-1 shows a simplified diagram of the two controllers
connected to the AHB, to the APB, and to each other.
ADVANCED
HIGH-PERFORMANCE
BUS (AHB)
Figure 4-1. LH79524/LH79525 LCD System, Simplified Block Diagram
COLOR LCD
ADVANCED
CONTROLLER
PERIPHERAL
BUS (APB)
ADVANCED LCD
INTERFACE
LCD PANEL
Version 1.0
INTERNAL
TO THE
LH79524/LH79525
EXTERNAL
TO THE
LH79524/LH79525
LH79525-46
4-1
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