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LCD CONTROLLER S3C2440A RISC MICROPROCESSOR
15-24
SAMSUNG TFT LCD PANEL (3.5” PORTRAIT / 256K COLOR / REFLECTIVE A-SI/TRANSFLECTIVE A-SI TFT
LCD)
The S3C2440A supports following SEC TFT LCD panels.
1. SAMSUNG 3.5” Portrait / 256K Color /Reflective a-Si TFT LCD.
LTS350Q1-PD1: TFT LCD panel with touch panel and front light unit
LTS350Q1-PD2: TFT LCD panel only
2. SAMSUNG 3.5” Portrait / 256K Color /Transflective a-Si TFT LCD.
LTS350Q1-PE1: TFT LCD panel with touch panel and front light unit
LTS350Q1-PE2: TFT LCD panel only
The S3C2440A provides timing signals as follows to use LTS350Q1-PD1 / PD2 and LTS350Q1-PE1 / PE2
LTS350Q1-PD1 / PD2 LTS350Q1-PE1 / PE2
STH: Horizontal Start Pulse
TP: Source Driver Data Load Pulse
INV: Digital Data Inversion
LCD_HCLK: Horizontal Sampling Clock
CPV: Vertical Shift Clock
STV: Vertical Start Pulse
OE: Gate On Enable
REV: Inversion Signal
REVB: Inversion Signal
STH: Horizontal Start Pulse
TP: Source Driver Data Load Pulse
INV: Digital Data Inversion
LCD_HCLK: Horizontal Sampling Clock
CPV: Vertical Shift Clock
STV: Vertical Start Pulse
LCCINV: Source drive IC sampling inversion signal
REV: VCOM modulation Signal
REVB: Inversion Signal
So, LTS350Q1-PD1/2 and PE1/2 can be connected with the S3C2440A without using the additional timing control
logic. But the user should additionally apply Vcom generator circuit, various voltages, INV signal and Gray scale
voltage generator circuit, which is recommended by PRODUCT INFORMATION (SPEC) of LTS350Q1-PD1/2 and
PE1/2. Detailed timing diagram is also described in PRODUCT INFORMATION (SPEC) of LTS350Q1-PD1/2 and
PE1/2.
Refer to the documentation (PRODUCT INFORMATION of LTS350Q1-PD1/2 and PE1/2), which is prepared by
AMLCD Technical Customer Center of Samsung Electronics Co., LTD.
CAUTION:
The S3C2440A has HCLK, working as the clock of AHB bus.
SEC TFT LCD panel (LTS350Q1-PD1/2 and PE1/2) has Horizontal Sampling Clock (HCLK).
These two HCLKs may cause a confusion. So, note that HCLK of the S3C2440A is HCLK and other HCLK of the
LTS350 is LCD_HCLK.
Check that the HCLK of SEC TFT LCD panel (LTS350Q1-PD1/2 and PE1/2) is changed to LCD_HCLK.