Product Subtitle / Keywords:
1.65 Inch Square Display, 360×360 Resolution, Transmissive a-Si IPS TFT, QSPI Interface, COG+FPC+B/L, 262K Colors, ST77916 Driver, 20-pin FPC, Capacitive Touch Panel (I²C), 85° Viewing Angle, 250 cd/m² Brightness, 1500:1 Contrast Ratio, -20°C~70°C Operating Temperature
1. Executive Summary & Product Positioning
The LSC0165I03-QS-V1, developed by LESSON (Wan'an) Zhixian Technology Co., Ltd., is a 1.65-inch transmissive amorphous Silicon TFT-LCD module with IPS (In-Plane Switching) technology and an integrated Capacitive Touch Panel (CTP).
This product specification book serves as the definitive technical document, defining its structural composition (COG+FPC+B/L), physical features, mechanical dimensions, electrical characteristics, complete QSPI (Quad SPI) pinout and timing, and comprehensive electro-optical performance. It delivers a square resolution of 360(RGB)×360 with 262K-color display capability, driven by the ST77916 controller, and includes a full CTP interface with I²C communication.
The document provides a complete set of technical indicators for design, production, and quality inspection. The unequivocal recommendation is to strictly adhere to the mechanical specifications, absolute maximum ratings, power supply conditions, and interface timing described herein.
2. Detailed Product Overview & Architecture
- Core Technology: Transmissive-type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display).
- Display Mode: Normally Black (transmissive, IPS).
- Display Characteristics: 65K/262K colors selectable.
- Module Construction: COG + FPC + B/L.
- Interface: QSPI (Quad Serial Peripheral Interface) – 4-bit data bus (QSPI_IO0~IO3) + SCL + CS.
- Viewing Direction: IPS (Free) – 85° typical in all directions (U/D/L/R).
- Driver IC: ST77916.
- Backlight: 3 white LEDs in parallel.
- Touch Panel: Integrated Capacitive Touch Panel with 5 dedicated pins: CTP_VCC (3.3V), CTP_RST, CTP_SCL (I²C clock), CTP_SDA (I²C data), CTP_INT (interrupt).
- Color Gamut: 72% NTSC typical.
- Approval Status: ☑ Approved Product Specification only.
3. Exhaustive Technical Specifications
3.1 Mechanical & Physical Specifications
| Item | Specification | Unit |
|---|---|---|
| Active area (H×V) | 41.90 × 41.90 | mm |
| Module outline (H×V×D) | 55.80 × 55.80 × 3.08 | mm |
| Number of pixels | 360(H) × RGB × 360(V) | pixels |
| Pixel pitch | 0.1164 × 0.1164 | mm |
| Panel Size (Diagonal) | 1.65 | inch |
Critical Mechanical Notes (from outline drawing):
- Display type: 1.65" TFT, transmissive, IPS.
- Driver IC: ST77916.
- Backlight: 3 chip white LEDs, parallel.
- Operating temp: -20°C ~ +70°C.
- Storage temp: -30°C ~ +80°C.
- General tolerance: ±0.25 mm.
- TP structure: G+F, IC: CST816D (for CTP).
- TP requirements: Surface hardness ≥ 6H; Glass material: Asahi 1.1mm 2.5D black; Chemical strengthening CS ≥ 400MPa, DOL ≥ 8μm; Steel ball drop test (25mm, 64g, 30cm) 3 times not broken; Ink thickness ≤ 15μm; Dyne value ≥ 32A (before alcohol clean) or ≥ 34A (after).
- Working temperature/humidity range: -10°C ~ 60°C (TP specific) / broader LCM range applies.
3.2 Electrical Specifications
3.2.1 Absolute Maximum Ratings
(Not explicitly provided in excerpt; refer to DC table limits.)
3.2.2 Electrical Characteristics (DC)
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Power for analog | VCC – GND | 2.65 | 2.8 | 3.3 | V |
| I/O power supply | IOVCC | 1.65 | 1.8 | 3.3 | V |
| Power for CTP | TP‑VCC | 2.8 | 3.3 | 3.6 | V |
| Input current | Idd | — | 10 | 30 | mA |
| Input voltage 'H' level | VIH | 0.7×IOVCC | — | IOVCC | V |
| Input voltage 'L' level | VIL | GND | 0 | 0.3×IOVCC | V |
| Output voltage 'H' level | VOH | 0.8×IOVCC | — | IOVCC | V |
| Output voltage 'L' level | VOL | GND | 0 | 0.2×IOVCC | V |
3.2.3 Pin Description (20-pin FPC)
| PIN NO. | Symbol | Description |
|---|---|---|
| 1 | CTP_VCC 3.3V | Power Supply for CTP |
| 2 | CTP_RST 3.3V | CTP reset |
| 3 | CTP_SCL 3.3V | CTP IIC clock |
| 4 | CTP_SDA 3.3V | CTP IIC data |
| 5 | CTP_INT 3.3V | CTP interrupt |
| 6 | GND | Power Ground |
| 7 | GND | Power Ground |
| 8 | TE | Tearing effect output |
| 9 | RESET | LCD reset pin |
| 10 | QSPI_IO3 | QSPI data line 3 |
| 11 | QSPI_IO2 | QSPI data line 2 |
| 12 | QSPI_IO1 | QSPI data line 1 |
| 13 | QSPI_IO0 | QSPI data line 0 (in/out) |
| 14 | SCL | LCD serial clock input |
| 15 | CS | LCD chip select input (low enable) |
| 16 | VCC | Power for analog, digital & booster |
| 17 | GND | Power Ground |
| 18 | GND | Power Ground |
| 19 | LEDA | LED Anode (Backlight) |
| 20 | LEDK | LED Cathode (Backlight) |
3.2.4 QSPI Interface Timing Characteristics
Conditions: VDDI=1.65~3.3V, VDD=2.65~3.3V, GND=0V, Ta=25°C.
| Signal | Symbol | Parameter | MIN | MAX | Unit |
|---|---|---|---|---|---|
| CSX | T_CSS | Chip select setup time (write) | 15 | — | ns |
| CSX | T_CSH | Chip select hold time (write) | 15 | — | ns |
| CSX | T_CSS | Chip select setup time (read) | 60 | — | ns |
| CSX | T_SCC | Chip select hold time (read) | 65 | — | ns |
| CSX | T_CHW | Chip select "H" pulse width | 40 | — | ns |
| SCL | T_SCYCW | Serial clock cycle (Write) | 16 | — | ns |
| SCL | T_SHW | SCL "H" pulse width (Write) | 7 | — | ns |
| SCL | T_SLW | SCL "L" pulse width (Write) | 7 | — | ns |
| SCL | T_SCYCR | Serial clock cycle (Read) | 150 | — | ns |
| SCL | T_SHR | SCL "H" pulse width (Read) | 60 | — | ns |
| SCL | T_SLR | SCL "L" pulse width (Read) | 60 | — | ns |
| SDA (DIN) | T_SDS | Data setup time | 7 | — | ns |
| SDA (DIN) | T_SDH | Data hold time | 7 | — | ns |
| DOUT | T_ACC | Access time | 10 | 50 | ns |
| DOUT | T_OH | Output disable time | 15 | 50 | ns |
Write clock 16ns (62.5MHz) with 4-bit QSPI provides effective throughput up to 250 MB/s.
3.2.5 Backlight Unit
| Item | Specification | Unit |
|---|---|---|
| Configuration | 3 chip white LEDs, parallel | — |
| Drive Condition | IF = 20mA × 3 = 60mA (Typ) | — |
| Forward Voltage | 3.0V (Typ) | V |
3.3 Optical Specifications (Ta=25°C)
| Item | Symbol | Condition | Min. | Typ. | Max. | Unit | Note |
|---|---|---|---|---|---|---|---|
| Response time | Tr+Tf | θ=0°, Φ=0° | — | 25 | 35 | ms | — |
| Contrast Ratio | CR | θ=0°, Φ=0° | 1000 | 1500 | — | — | — |
| Luminance (White) | LV | θ=0°, Φ=0° | 200 | 250 | — | nit | — |
| Luminance uniformity | δWHITE | — | 70 | 80 | — | % | — |
| Viewing angle | Θ3 / Θ9 / Θ6 / Θ12 | CR > 10 | 80 | 85 | — | deg | All directions |
(CIE chromaticity data: White point Wx ~0.318, Wy typical, with ±0.03 tolerance.)
3.4 Capacitive Touch Panel (CTP) Interface
- Communication: I²C (CTP_SCL, CTP_SDA)
- Power: CTP_VCC = 3.3V (2.8V min, 3.6V max)
- Control: Reset (CTP_RST), Interrupt (CTP_INT)
- Touch Controller IC: CST816D (inferred from TP requirements)
3.5 Version Record
(Not provided in excerpt; assume initial release.)
4. Application Guidelines & Critical Notes
Intended Use
- Wearable devices (smartwatches, fitness trackers)
- Compact IoT interfaces
- Portable medical devices
- Any application requiring a high-resolution square display with touch input
Critical Design Considerations
-
QSPI High-Speed Layout:
The write clock is 16ns (62.5 MHz). Keep QSPI traces (IO0-IO3, SCL, CS) short and length-matched to within 0.5mm. Use series resistors (10-22Ω) near the source. This is a 4-bit parallel bus – ensure signal integrity. -
Power Supplies:
- VCC (2.8V typical): Main analog, digital, and booster supply.
- IOVCC (1.8V typical): I/O interface supply.
- CTP_VCC (3.3V typical): Separate 3.3V rail for capacitive touch controller.
- Backlight: Constant-current driver with 60mA at 3.0V (typical).
-
CTP Integration:
- The CTP uses I²C at 3.3V. Implement an I²C master in your MCU.
- The INT pin signals a touch event; connect to MCU interrupt input.
- Follow CST816D initialization sequence per its datasheet.
-
TE Pin (Pin 8):
Use for tearing effect synchronization to correlate microcontroller writes with display refresh, preventing visual artifacts. -
Mechanical:
- Module outline: 55.8×55.8mm; active area: 41.9mm square.
- The CTP cover glass is 1.1mm thick with 2.5D edges.
- Observe the 0.3mm bezel opening recommendation (active area minus 0.3mm per side).
- The backlight wiring area protrudes – ensure housing clearance.
-
Temperature:
- LCM operating: -20°C to +70°C.
- LCM storage: -30°C to +80°C.
- TP operating: -10°C to +60°C (stricter; design for TP if touch used).
-
Storage Temperature Limit: Note that the absolute maximum storage temperature for some similar models is 70°C; verify for this module. The outline drawing shows storage temp -30°C~+80°C for the LCM, but TP storage range may differ.
Handling & Compliance
- ROHS compliant.
- ESD precautions required; avoid touching COG area.
- CTP surface: ≥6H hardness; use proper cleaning (alcohol) to maintain dyne level.
- Avoid sharp bending of FPC; the FPC has PI reinforcement.
5. Conclusion
The LSC0165I03-QS-V1 is a premium 1.65-inch square IPS display with a high-speed QSPI interface and an integrated capacitive touch panel – ideal for smartwatches and compact UIs.
Key Strengths:
- IPS technology with 85° viewing angles in all directions.
- 1500:1 contrast ratio and 72% NTSC color gamut.
- QSPI interface with 62.5 MHz clock enables rapid screen updates.
- Complete CTP solution with I²C and interrupt support.
- Dedicated TE pin for tear-free animation.
- Comprehensive mechanical and optical specifications provided.
Primary Design Challenges:
- High-speed QSPI PCB layout (impedance control, length matching).
- CTP I²C driver development with calibration.
- Proper power sequencing (VCC, IOVCC, CTP, backlight).
- Mechanical integration of the 2.5D cover glass and FPC routing.
This module is the top choice for any compact, high-resolution, touch-enabled display application requiring excellent image quality and a modern high-speed interface.
