Product Subtitle / Keywords:
1.2 Inch Display, 240(RGB)×240 Resolution, Transmissive a-Si TFT IPS, 8-bit 8080 / 4-SPI Interface, COG+FPC+B/L, 262K Colors, NV3002C Driver, 21-pin FPC, 400 cd/m² Brightness, 1200:1 Contrast Ratio, -20°C~70°C Operating Temperature
1. Executive Summary & Product Positioning
The LS012I02-MS-V1, developed by LESSON(Wanan) Smart Display Technology Co., Ltd. (立信(万安)智显科技有限公司), is a 1.2-inch transmissive amorphous Silicon TFT-LCD module with IPS (In-Plane Switching) technology.
This product specification (Revision 1.0, Module Type: COG+FPC+B/L) serves as the definitive technical document, defining its structural composition (COG+FPC+B/L), physical features, mechanical dimensions, absolute maximum ratings, detailed electrical characteristics, complete 8-bit 8080 / 4-SPI interface pinout and timing, and comprehensive electro-optical performance. It delivers a square resolution of 240(RGB)×240 with 262K-color display capability, driven by the NV3002C controller.
The document provides the core parameters necessary for system integration into compact embedded display applications. The unequivocal recommendation for engineers is to strictly adhere to the electrical specifications, interface timing, and mechanical tolerances described herein to ensure reliable performance and compatibility.
2. Detailed Product Overview & Architecture
- Core Technology: Transmissive-type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display).
- Display Mode: Active matrix TFT, Transmissive type, IPS.
- Display Characteristics: Capable of displaying up to 262 thousand colors.
- Module Construction: COG (Chip-On-Glass) + FPC (Flexible Printed Circuit) + B/L (Backlight Unit). Composed of a TFT-LCD panel, a driver circuit, and a backlight unit.
- Input Data: 8bit 8080 / 4SPI (configurable via IM pin).
- Viewing Direction (Grayscale Inversion): Free (IPS) – wide viewing angle in all directions.
- Drive IC: NV3002C.
- Approval Status: ☑ Approved Product Specification only (as per signature block).
3. Exhaustive Technical Specifications
3.1 Mechanical & Physical Specifications
| Item | Specification | Unit |
|---|---|---|
| Module size (H×V×D) | 32.56 × 34.31 × 1.56 | mm |
| Active area (H×V) | 30.24 × 30.24 | mm |
| Number of dots / Resolution | 240(RGB) × 240 | pixel |
| Panel Size (Diagonal) | 1.2 | inch |
Critical Mechanical Design Notes (from document):
- Display Type: Main LCD: Transmissive, IPS.
- Operating Temperature: -20°C ~ +70°C.
- Storage Temperature: -30°C ~ +80°C.
- Main LCD Driver: NV3002C.
- Backlight: 1 LED.
- General Tolerance: ±0.20 mm (Segments to edge of glass).
- Bezel Opening Design: It is recommended that the housing's visible area be at least 0.3mm smaller per side than the module's viewing area (VAmds).
- Foam Gasket Cutout Design: The cutout in the chassis foam gasket should be at least 0.6mm larger per side than the module's viewing area (VAmds).
- TP/Conductor Isolation: The Touch Panel (TP) edges must not come into contact with any metal conductors.
- ROHS Compliance: Yes.
3.2 Electrical & Interface Specifications
3.2.1 Absolute Maximum Ratings
| Item | Symbol | Min | Max | Unit | Remark |
|---|---|---|---|---|---|
| Supply voltage | VCC | -0.3 | 4.6 | V | Note1, Note2 |
| Supply voltage | IOVCC | -0.3 | 4.6 | V | Note1, Note2 |
| Operating temperature | TOPR | -20 | 70 | °C | Note1, Note2 |
| Storage temperature | TSTR | -30 | 80 | °C | Note1, Note2 |
Notes (interpreted):
- Note1/Note2: Stress beyond these ratings may cause permanent damage; functional operation is not implied under these conditions.
3.2.2 Electrical Characteristics (DC – Recommended Operating Conditions)
| Item | Item | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Supply voltage | Supply voltage | VCC | 2.5 | 2.8 | 3.6 | V |
| Supply voltage | Supply voltage | IOVCC | 1.65 | 2.8 | 3.6 | V |
| Input Voltage (L level) | Input Voltage (L level) | VIL | 0 | — | 0.3 * IOVCC | V |
| Input Voltage (H level) | Input Voltage (H level) | VIH | 0.7 * IOVCC | — | IOVCC | V |
3.2.3 Pin Description (21-pin FPC)
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 15 | IM | P | Interface mode selection. IM=0: 8bit 8080. IM=1: 4SPI. |
| 16 | CS | I | Chip select input pin ("Low" enable). |
| 17 | IOVCC | P | Low voltage power supply for interface logic circuits (1.65~3.6V) |
| 18 | GND | P | System ground level for dynamic state. |
| 19 | VCC | P | High voltage power supply for analog circuit blocks (2.5~3.6V) |
| 20 | LEDK | P | Power for LED backlight cathode |
| 21 | LEDA | P | Power for LED backlight anode |
(Not all pin numbers are shown in the excerpt. See full data sheet for the complete pinout.)
Interface Mode Selection:
- IM=0: 8-bit 8080 parallel interface.
- IM=1: 4-wire serial peripheral interface (4SPI).
3.2.4 Parallel 8080 Interface Timing Characteristics
Conditions: IOVCC=2.8V, VCIB=2.8V, DGND=0V, Ta=25°C.
| Signal | Symbol | Parameter | Min | Max | Unit | Description |
|---|---|---|---|---|---|---|
| RDX (FM) | trdhfm | Read Control H duration(FM) | 180 | — | ns | — |
| RDX (FM) | trdlfm | Read Control L duration(FM) | 200 | — | ns | — |
| RDX (ID) | trc | Read Cycle (ID) | 160 | — | ns | — |
| RDX (ID) | trdh | Read Control H pulse duration | 90 | — | ns | — |
| RDX (ID) | trdl | Read Control L pulse duration | 70 | — | ns | — |
| D7[0, 0] | tdst | Write data setup time | 10 | — | ns | For maximum CL=30pF |
| D7[0, 0] | tdht | Write data hold time | 10 | — | ns | For maximum CL=30pF |
| D7[0: 0] | trat | Read access time | — | 40 | ns | For minimum CL=8pF |
| D7[0: 0] | tratfm | Read access time | — | 340 | ns | For minimum CL=8pF |
Key Timing Observation:
- Read from Frame Memory (FM): trdhfm = 180ns, trdlfm = 200ns.
- Read ID: trc = 160ns.
- Data setup/hold: tdst = tdht = 10ns.
3.2.5 Backlight Unit
| Item | Specification | Unit |
|---|---|---|
| LED Circuit | 1 LED (from mechanical drawing) | — |
| Drive Condition | IF = 40mA, VF = 2.8 ~ 3.3V | — |
| Luminance (IF = 40mA) | 400 cd/m² (Typ) | cd/m² |
3.3 Optical & Electro-Optical Characteristics (Ta=25°C)
| Item | Item | Symbol | Condition | Min. | Typ. | Max. | Unit | Remark |
|---|---|---|---|---|---|---|---|---|
| Response time | Response time | Tr + Tf | θx = θy = 0 | — | 25 | 36 | ms | Note 1 |
| Contrast Ratio | Contrast Ratio | CR | θx = θy = 0 | 1000 | 1200 | — | — | Note 2 |
| Transmittance | Transmittance | T% | θx = θy = 0 | 3.65 | 4.3 | — | % | |
| Color Chromaticity (CIE1931) | White | W x | θx = θy = 0 | — | 0.293 | — | — | |
| Color Chromaticity (CIE1931) | White | W y | θx = θy = 0 | — | 0.335 | — | — | |
| Viewing angle | θT | CR > 10 | 80 | 85 | — | Deg. | Note 3 | |
| Viewing angle | θB | CR > 10 | 80 | 85 | — | Deg. | Note 3 | |
| Viewing angle | θL | CR > 10 | 80 | 85 | — | Deg. | Note 3 | |
| Viewing angle | θR | CR > 10 | 80 | 85 | — | Deg. | Note 3 | |
| Luminance (IF = 40mA) | L | — | 400 | cd/m² |
Notes (from document):
- Response Time: Ambient temperature = 25°C.
- Contrast Ratio (CR): Measured at the center of the LCD surface. CR = Luminance (white raster) / Luminance (black raster).
- Viewing Angle: Determined for the horizontal (3, 9 o'clock) and vertical (6, 12 o'clock) directions. The module has 85° (Typ) symmetrical viewing angles in all directions, characteristic of IPS technology.
- Color Chromaticity: Measured with Otsuta chromaticity meter.
3.4 Reliability Specification
| No. | Test Item | Test Condition | Inspection after test |
|---|---|---|---|
| 3 | High Temperature Operating | 70±2℃/120 hours | No defects: air bubble, seal leak, non-display, missing segments, glass crack, or current Idd > 2x initial value. |
| 4 | Low Temperature Operating | -20±2℃/120 hours | Same criteria as above. |
| 7 | Vibration Test | 10Hz~55Hz~10Hz, Amplitude: 1.5mm, X,Y,Z directions, total 3 hours | Same criteria as above. |
Remark: After the test, the LCD sample must be stored at room temperature for 2-4 hours before inspection.
4. Application Guidelines & Critical Notes
Intended Use
- Smartwatches, fitness trackers, and other wearable devices
- IoT display nodes and smart home controls
- Miniature handheld instruments
- Any application requiring a compact, high-resolution square display with IPS viewing angles
Critical Design Considerations
-
Interface Mode Selection (IM Pin): The IM pin (Pin 15) selects the interface mode. IM=0 for 8-bit 8080 parallel, IM=1 for 4-wire SPI. This pin must be configured before power-up. Unused data pins in SPI mode must be fixed to DGND or IOVCC.
-
IPS Viewing Angle: This module features IPS technology with 85° (Typ) viewing angles in all directions, providing excellent image quality from any perspective.
-
Power Supply:
- Provide stable VCC (2.8V typical) for the main logic.
- Provide stable IOVCC (2.8V typical) for the I/O interface.
- The backlight requires a constant-current LED driver set to 40 mA at 2.8~3.3V.
-
Mechanical Integration:
- Module Outline: 32.56mm (H) × 34.31mm (V) × 1.56mm (D) – ultra-thin profile.
- Active Area: 30.24mm × 30.24mm – a perfectly square display.
- Bezel Opening: Design the housing window 0.3mm smaller per side than the viewing area.
- Foam Gasket: Design the cutout 0.6mm larger per side than the viewing area.
- FPC: The module uses a 21-pin FPC. The exact pitch is not specified in the excerpt, but should be verified from the mechanical drawing (typically 0.5mm or 0.8mm for such modules).
-
Unused Pin Handling:
- If using 4-wire SPI mode (IM=1), the 8-bit data bus pins (D7-D0) should be fixed to DGND level.
-
Temperature Limits:
- Operating Temperature: -20°C to +70°C.
- Storage Temperature: -30°C to +80°C.
Handling & Compliance
- The module is ROHS compliant.
- Observe standard ESD precautions during handling and assembly.
- The module contains fragile glass and a 21-pin FPC – handle with care.
- The module is ultra-thin (1.56mm) – be careful when handling to avoid flexing.
5. Conclusion & Design-In Support
The LS012I02-MS-V1 specification details a compact 1.2-inch square IPS display module with a flexible 8-bit 8080 or 4-wire SPI interface — an excellent choice for space-constrained, high-performance wearable and compact display applications.
Key Strengths:
-
IPS Technology: 85° (Typ) symmetrical viewing angles in all directions ensure consistent image quality from any angle — ideal for wearable devices.
-
High Contrast Ratio: 1200:1 (Typ) provides deep blacks and bright whites.
-
High Resolution Square Format: 240×240 resolution in a 1.2-inch square form factor — perfect for round or circular watch face UIs (with circular masking).
-
Dual Interface Options: Both 8-bit 8080 parallel and 4-wire SPI interfaces are available, selectable via IM pin.
-
Ultra-Thin Profile: The module is only 1.56mm thick, making it ideal for compact enclosures.
-
Excellent Brightness: 400 cd/m² (Typ) brightness ensures readability in indoor and most outdoor conditions.
-
Standard Package: Comes with COG, FPC, and backlight unit, simplifying integration.
Main Design Focus:
- The critical design task is configuring the interface mode (IM pin) correctly and ensuring proper termination of unused pins.
- Supporting requirements:
- Provide stable VCC (2.8V) and IOVCC (2.8V) power (can share a single 2.8V rail).
- Provide a constant-current backlight driver set to 40 mA at 3.0V.
- Mechanical integration — follow the bezel opening and foam cutout guidelines.
- FPC connector — verify the 21-pin FPC pitch from the mechanical drawing.
