LS121I02-L-V1: 12.1-Inch a-Si TFT-LCD Module, 1280×800 WXGA Resolution, 16.7M Colors, LVDS Interface, 40-Pin, LED Backlight, Normally Black, Automotive & Industrial Display Application
Product Subtitle / Keywords
12.1 Inch Display, 1280(RGB)×800 WXGA Resolution, Transmissive a-Si TFT-LCD, LVDS Interface (1-port 8-bit VESA Format), TFT-LCD Panel+Driver IC+Backlight Unit, 16.7M Colors (8-bit), 40-Pin Connector (MSAK24025P40G Or Equivalent), 3.3V Power Supply, -20°C~70°C Operating Temperature, -30°C~80°C Storage Temperature, White LED Backlight (IF=240mA, VF=21.6~26.4V), 16:10 Aspect Ratio, 72% NTSC Color Gamut, Ultra Wide Viewing Angle, Normally Black Mode, Lesson Smart Display Technology
1. Executive Summary & Product Positioning
The LS121I02-L-V1, developed by Lixin (Wan'an) Intelligent Display Technology Co., Ltd. (Lesson Smart Display Technology Co., Ltd), is a 12.1-inch transmissive type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display) module.
This product specification serves as the definitive technical document, defining its structural composition (TFT-LCD Panel + Driver Circuit + Backlight Unit), general description, physical features, electrical characteristics, and complete LVDS interface pinout (40-pin). It delivers a high-definition resolution of 1280(RGB)×800 (WXGA) with 16.7M-color (8-bit) display capability. The module supports high contrast ratio and ultra wide viewing angle making it suitable for various applications.
The document provides the core parameters necessary for system integration into embedded display applications requiring a mid-size high-resolution display with a standard low-voltage differential signaling interface. 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) module, which is composed of a TFT-LCD panel, a driver circuit and a backlight unit.
- Display Mode: Transmissive type, Normally Black mode.
- Display Format: Graphic 1280(RGB)×800 pixel array (WXGA).
- Display Characteristics: Capable of displaying up to 16.7 million colors (8-bit).
- Module Construction: Panel (a-Si TFT) + Driver Circuit + Backlight Unit.
- Interface Type: LVDS (Low Voltage Differential Signaling) interface (1-port 8-bit VESA format as per general description).
- Connector Pin Count: 40-Pin connector used for both LCD module electronics interface and backlight unit (MSAK24025P40G or equivalent).
- Backlight LED: White LED backlight with IF=240mA and VF=21.6~26.4V range. Note that the backlight circuit uses external boost driver on customer board.
- Color Gamut: 72% NTSC (typical).
- Approval Status: Product specification as per document version.
3. Exhaustive Technical Specifications
3.1 Mechanical & Physical Specifications
| Panel Size (Diagonal) | 12.1 inch |
| Number of Dots / Resolution | 1280(RGB) × 800 pixel |
| Display Type | a-Si TFT-LCD, Transmissive |
| Module Construction | TFT-LCD Panel + Driver Circuit + Backlight Unit |
| Display Colors | 16.7M (8-bit) |
| Pixel Format | 1280(RGB) × 800 |
| Backlight Type | White LED (IF=240mA, VF=21.6~26.4V) |
Critical Mechanical Design Notes :
- Active area dimensions are specified in the product documentation. Width and height are calculated based on 12.1-inch diagonal WXGA ratio.
- Module outline dimensions include the panel, driver circuit board, and backlight assembly.
- Connector type: MSAK24025P40G (STM) or equivalent 40-pin connector for both signal and backlight interface.
- Standard tolerance: ±0.3mm unless specified otherwise.
- RoHS compliance is ensured.
- The module weight is typical value to be confirmed by actual measurements.
3.2 Electrical & Interface Specifications
3.2.1 Absolute Maximum Ratings
| Item | Symbol | Min | Max | Unit | Remark |
|---|---|---|---|---|---|
| Logic Supply Voltage | VCC | -0.3 | 4.0 | V | Note1 |
| Backlight Voltage | VBL | -0.3 | 30.0 | V | Note1 |
| Operating Temperature | TOPR | -20 | 70 | °C | Note2 |
| Storage Temperature | TSTR | -30 | 80 | °C | Note2 |
3.2.2 Backlight Electrical Characteristics
| Parameter | Symbol | Min. | Typ. | Max. | Unit | Remark |
|---|---|---|---|---|---|---|
| LED Forward Current | IF | - | 240 | - | mA | Backlight LED Circuit |
| LED Forward Voltage | VF | 21.6 | - | 26.4 | V | Backlight LED Circuit |
| LED Lifetime | LIFE | - | 50,000 | - | Hrs | Note: IF condition 240mA at 25°C |
3.2.3 LVDS Interface Pin Assignment
| Pin No. | Symbol | I/O | Function | Remark |
|---|---|---|---|---|
| 1 | VCC | P | Power Supply (3.3V) | Logic Power |
| 2 | VCC | P | Power Supply (3.3V) | Logic Power |
| 3 | GND | P | Ground | - |
| 4 | GND | P | Ground | - |
| 5 | RXIN0- | I | LVDS Differential Data Input (Negative) | Channel 0 |
| 6 | RXIN0+ | I | LVDS Differential Data Input (Positive) | Channel 0 |
| 7 | GND | P | Ground | - |
| 8 | RXIN1- | I | LVDS Differential Data Input (Negative) | Channel 1 |
| 9 | RXIN1+ | I | LVDS Differential Data Input (Positive) | Channel 1 |
| 10 | GND | P | Ground | - |
| 11 | RXIN2- | I | LVDS Differential Data Input (Negative) | Channel 2 |
| 12 | RXIN2+ | I | LVDS Differential Data Input (Positive) | Channel 2 |
| 13 | GND | P | Ground | - |
| 14 | RXCLK- | I | LVDS Differential Clock Input (Negative) | - |
| 15 | RXCLK+ | I | LVDS Differential Clock Input (Positive) | - |
| 16 | GND | P | Ground | - |
| 17 | RXIN3- | I | LVDS Differential Data Input (Negative) | Channel 3 |
| 18 | RXIN3+ | I | LVDS Differential Data Input (Positive) | Channel 3 |
| 19 | GND | P | Ground | - |
| 20 | NC | - | No Connection | - |
| 21 | NC | - | No Connection | - |
| 22 | GND | P | Ground | - |
| 23 | LED_A | P | Backlight Anode | External Boost |
| 24 | LED_A | P | Backlight Anode | External Boost |
| 25 | LED_K | P | Backlight Cathode | External Boost |
| 26 | LED_K | P | Backlight Cathode | External Boost |
| 27 | NC | - | No Connection | - |
| 28 | NC | - | No Connection | - |
| 29 | NC | - | No Connection | - |
| 30 | NC | - | No Connection | - |
| 31 | NC | - | No Connection | - |
| 32 | NC | - | No Connection | - |
| 33 | NC | - | No Connection | - |
| 34 | NC | - | No Connection | - |
| 35 | NC | - | No Connection | - |
| 36 | NC | - | No Connection | - |
| 37 | NC | - | No Connection | - |
| 38 | NC | - | No Connection | - |
| 39 | NC | - | No Connection | - |
| 40 | NC | - | No Connection | - |
Note: I = Input, O = Output, P = Power. The connector type is MSAK24025P40G (STM) or equivalent.
3.3 Optical Characteristics
| Parameter | Symbol | Condition | Min. | Typ. | Max. | Unit | Remark |
|---|---|---|---|---|---|---|---|
| Contrast Ratio | CR | θx=θy=0° | - | - | - | - | High Contrast |
| Response Time | Tr+Tf | θx=θy=0° | - | 30 | 35 | ms | Note 6 |
| Color Gamut | NTSC | CIE1931 | - | 72% | - | % | Centre point |
Note: Optical characteristics are measured with LED backlight at 25±2°C. Measurements are taken at the center of the panel.
3.4 Environmental & Reliability Specifications
| Parameter | Condition | Duration | Result |
|---|---|---|---|
| High Temperature Storage | 80°C | 72 Hours | No defects |
| Low Temperature Storage | -30°C | 72 Hours | No defects |
| High Temperature Operation | 70°C | 72 Hours | No defects |
| Low Temperature Operation | -20°C | 72 Hours | No defects |
| High Temperature & Humidity | 40°C, 90% RH | 72 Hours | No defects |
Application Scenario: The LS121I02-L-V1's 12.1-inch size and WXGA resolution make it ideally suited for industrial control panels, medical equipment displays, in-vehicle infotainment systems, point-of-sale terminals, and portable computing devices used in harsh environments. Its wide operating temperature range and high contrast ratio ensure reliable performance in demanding applications.
Handling Precautions: The LCD panel is made of glass and is fragile. The polarizer surface is easily scratched. Avoid bending the module and handle with care to prevent damage. ESD protection is required during handling. Store in a clean dry environment away from direct sunlight and corrosive gases. Follow the recommended power-up sequence to ensure long-term reliability.
Compliance: The LS121I02-L-V1 module complies with RoHS environmental requirements, ensuring environmentally safe materials and manufacturing processes.
