ST
Sitronix
ST7787
262K Color Single-Chip TFT Controller/Driver
1. Introduction
The ST7787 is a single-chip controller/driver for 262K-color, graphic type TFT-LCD. It consists of 720 source line and
320 gate line driving circuits. This chip is capable of connecting directly to an external microprocessor, and accepts Serial
Peripheral Interface (SPI), 8-bits/9-bits/16-bits/18-bits parallel interface. Display data can be stored in the on-chip display
data RAM of 240x320x18 bits. It can perform display data RAM read/write operation with no external operation clock to
minimize power consumption. In addition, because of the integrated power supply circuits necessary to drive liquid crystal,
it is possible to make a display system with the fewest components.
2. Features
Single chip TFT-LCD controller/driver with display data RAM
Display resolution: 240(H) x RGB x 320(V)
Display data RAM (frame memory): 240 x 320 x 18-bits = 1,382,400 bits
Operation Frequency: DC~30MHz (30MHz for 6 bits, 10MHz for 18 bits)
Output:
- 240ch source outputs (240RGB)
- 320ch gate outputs
- Common electrode output
Display mode (color mode)
- Full color mode (idle mode off): 262K-colors
- Reduce color mode (idle mode on): 8-colors (1-bit for individual R, G, B color depth)
Display resolution option
- 240 x 320 Display with 240 x 18-bits x 320 display RAM
Supported LC type option
- MVA LC type (When LCM[1]=0,LCM[0]=0 )
- Transflective LC type (When LCM[1]=0,LCM[0]=1 )
- Transmissive LC type (When LCM[1]=1,LCM[0]=0 )
Supported data format on display host interface
- 12-bits/pixel: RGB= (444) using the 1382k bits frame memory and LUT
- 16-bits/pixel: RGB= (565) using the 1382k bits frame memory and LUT
- 18-bits/pixel: RGB= (666) using the 1382k bits frame memory
Supported MCU Interface
- 3-line serial interface
- 8-bits, 9-bits, 16-bits, 18-bits interface with 8080-series MCU
- 8-bits, 9-bits, 16-bits, 18-bits interface with 6800-series MCU
- 6-bits, 16-bits, 18-bits RGB interface with graphic controller
Display features
- Area scrolling
- Partial display mode
- Software programmable color depth mode
Build-in circuit
- DC/DC converter
- Adjustable VCOM generation
- Non-volatile (NV) memory to store initial register setting
- Oscillator for display clock generation
- Timing controller
- 4 preset gamma curve for γ=1.0/1.8/2.2/2.5 (supporting Transflective) and 1 preset gamma curve for γ=2.2
(supporting MVA, Ttransmissive type LC)
- Factory default value (contrast, module ID, module version, etc) are stored in NV memory
- Line inversion, frame inversion
NV Memory
- 8-bits for ID1
- 7-bits for ID2
- 8-bits for ID3
- 8-bits for VCOM adjustment
Supply voltage range
- Analog supply voltage range (VDD to AGND): 2.45V – 3.3V
- I/O supply voltage range (VDDI to DGND): 1.65V – 3.3V
Sitronix Technology Corp. reserves the right to change the contents in this document without prior notice.
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