LSC121I03-L-V3 | 12.1 inch TFT-LCD | 1280x800 (WXGA) | LVDS | With CTP
1. Executive Summary & Product Positioning
The LSC121I03-L-V3 is a 12.1-inch color active matrix TFT-LCD (Thin Film Transistor Liquid Crystal Display) module developed by 立信(万安)智显科技有限公司 (Lesson Smart Display Technology Co., Ltd). This module uses amorphous silicon TFT as a switching device and is composed of a TFT LCD panel and a driving circuit. The panel size is 12.1 inch (16:10) and the resolution is 1280(H) * 800(V), the panel can display up to 16.7M colors (8-bit).
Product Positioning: Designed for a wide range of industrial and commercial applications requiring a high-resolution, high-brightness WXGA display with the widely-adopted LVDS interface. The module features a high typical brightness of 500 cd/m², a high contrast ratio of 1200:1, and a wide color gamut of 72% NTSC. It supports image reversion (UP/DOWN and LEFT/RIGHT) for flexible mounting. The AG25 (Anti-Glare) surface treatment enhances readability in bright environments. With its high brightness, high contrast, and standard LVDS interface, this module is ideally suited for industrial HMIs, kiosks, POS terminals, medical equipment, and other embedded display systems.
2. Detailed Product Overview & Architecture
The module's architecture is designed for robust performance and straightforward integration. The primary components include:
- TFT-LCD Panel: 12.1-inch diagonal, a-Si TFT active matrix, transmissive display mode, Normal Black. The resolution is 1280(H) × 800(V) pixels with an active area of 261.12 (H) × 163.20 (V) mm. The pixel arrangement is RGB Stripe.
- Driver IC & TCON: The module integrates an LVDS receiver to support the standard LVDS interface (1-port, 8-bit, VESA format). The typical pixel clock frequency is 72.4 MHz and the refresh rate is 60 Hz.
- Backlight Unit (B/L): A white LED edge-lit backlight unit. The backlight is configured as 8串6并 (8 strings of 6 LEDs in parallel = 48 LEDs total), driven by an external constant current source. The driving condition is IF=240mA, VF=23~26.4V (Typ. 24V). The typical backlight power consumption is 5.76W.
- Mechanical Construction: The module includes an LCD panel, driving circuit, and backlight. The module outline dimensions are 277.7 (H) × 180.6 (V) × 7.5 (D) mm. The surface treatment of the front polarizer is AG25 (Anti-Glare).
- Interface: The module communicates via a 40-pin connector (MSAK24025P40G or equivalent). The main display interface is LVDS (4 data pairs + 1 clock pair).
3. Exhaustive Technical Specifications
3.1 General & Mechanical Specifications
| Item | Specification |
| Display Size (Diagonal) | 12.1 inches (16:10) |
| Resolution (Dots) | 1280(H) × 800(V) (WXGA) |
| Display Technology | a-Si TFT, Transmissive, Normally Black |
| Color Depth | 16.7M colors (8-bit) |
| Pixel Pitch (H×V) | 68.0(H) × 204.0(V) × 3 µm |
| Pixel Arrangement | RGB Vertical Stripe |
| Display Mode | Normal Black |
| Surface Treatment | AG25 (Anti-Glare) |
| Luminance (Brightness, Typ) | 500 cd/m² |
| Contrast Ratio (Typical) | 1200:1 (Typ) |
| Color Gamut | 72% NTSC (Typ) |
| Viewing Angle (CR>10) | 85°/85°/85°/85° (U/D/L/R, Typ) |
| Response Time (Tr+Tf) | 30ms (Typ), 35ms (Max) |
| Active Area (H×V) | 261.12 × 163.20 mm |
| Outline Dimension (H×V×D) | 277.7 × 180.6 × 7.5 mm |
| Interface | LVDS 1-port (8-bit VESA format) |
| Backlight | White LED, 48 LEDs (8串6并), IF=240mA (Typ), VF=24V (Typ) |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
| Image Reversion | UP/DOWN and LEFT/RIGHT (Supported) |
3.2 Interface & Electrical Specifications
3.2.1 Absolute Maximum Ratings (Operating)
| Parameter | Symbol | Min. | Max. | Unit |
|---|---|---|---|---|
| Power Supply Voltage (Logic) | VDD | VSS-0.3 | 3.6 | V |
| LED Power Supply Voltage | VLED | 23 | 26.4 | V |
| Operating Temperature | Topa | -20 | 70 | °C |
| Storage Temperature | Tstg | -30 | 80 | °C |
3.2.2 TFT LCD Module Electrical Specification
| ITEM | SYMBOL | MIN | TYP | MAX | UNIT |
|---|---|---|---|---|---|
| Power Supply Voltage (Logic) | VDDIN | 3.0 | 3.3 | 3.6 | V |
| Power Supply Current (Logic) | IVDDIN | 120 | 180 | 280 | mA |
| LED Supply Voltage | VLED | 23 | 24 | 26.4 | V |
| LED Supply Current | IVLED | -- | 240 | -- | mA |
| Backlight Power Consumption | -- | -- | 5.76 | 6.14 | W |
Note: This model features a high-brightness backlight. The backlight power is supplied by an external boost circuit on the client's board. The on-board TCON's backlight boost circuit is not used.
3.2.3 Backlight Unit Characteristics
| PARAMETER | Sym. | Min. | Typ. | Max. | Unit | Test Condition |
|---|---|---|---|---|---|---|
| LED Current | IF | -- | 240 | -- | mA | - |
| LED Voltage | VF | 23 | 24 | 26.4 | V | IF=240mA |
| Luminous Intensity (Center) | -- | 450 | 500 | -- | Cd/m² | IF=240mA |
| Life Time | -- | -- | 30,000 | -- | Hr. | IF=240mA |
3.2.4 Interface Timing Parameter
| Item | Symbol | min | typ | max | UNIT |
|---|---|---|---|---|---|
| Frame Rate | - | 58 | 60 | 62 | Hz |
| Pixel Clock Rate | - | 66.3 | 72.4 | 78.9 | MHz |
| Horizontal total time | tHP | 1380 | 1440 | 1500 | tCLK |
| Horizontal Active time | tHadr | 1280 | 1280 | 1280 | tCLK |
| Horizontal Back Porch | tHBP | - | 78 | - | tCLK |
| Horizontal Front Porch | tHFP | - | 72 | - | tCLK |
| Vertical total time | tvp | 824 | 838 | 872 | tH |
| Vertical Active time | tVadr | 800 | 800 | 800 | tH |
| Vertical Back Porch | tVBP | - | 18 | - | tH |
| Vertical Front Porch | tVFP | - | 15 | - | tH |
| Number of LVDS Lanes | - | - | 1 | - | Lane |
3.2.5 Pin Assignment (40-Pin Connector)
Connector Model: MSAK24025P40G (STM) or equivalent.
| Pin No. | Symbol | Description | Pin No. | Symbol | Description |
|---|---|---|---|---|---|
| 1 | NC | Non Connection | 21 | RIN3+ | LVDS Positive data signal (+) |
| 2 | VDDIN | Power supply (3.3V Typ.) | 22 | GND | GROUND |
| 3 | VDDIN | Power supply (3.3V Typ.) | 23 | NC | Non Connection |
| 4 | VDDIN | Power supply (3.3V Typ.) | 24 | NC | Non Connection |
| 5 | NC | Non Connection | 25 | GND | GROUND |
| 6 | GND | GROUND | 26 | NC | Non Connection |
| 7 | GND | GROUND | 27 | NC | Non Connection |
| 8 | RIN0- | LVDS Negative data signal (-) | 28 | GND | GROUND |
| 9 | RIN0+ | LVDS Positive data signal (+) | 29 | NC | Non Connection |
| 10 | GND | GROUND | 30 | NC | Non Connection |
| 11 | RIN1- | LVDS Negative data signal (-) | 31 | GND | GROUND |
| 12 | RIN1+ | LVDS Positive data signal (+) | 32 | GND | GROUND |
| 13 | GND | GROUND | 33 | GND | GROUND |
| 14 | RIN2- | LVDS Negative data signal (-) | 34 | NC | Non Connection |
| 15 | RIN2+ | LVDS Positive data signal (+) | 35 | PWM/NC | PWM dimming control input pin. |
| 16 | GND | GROUND | 36 | LED_EN/NC | The enable pin to LED Driver. |
| 17 | LVDS_CLK- | LVDS Negative CLK signal (-) | 37 | NC | Non Connection |
| 18 | LVDS_CLK+ | LVDS Positive CLK signal (+) | 38 | VLED/NC | LED Anode |
| 19 | GND | GROUND | 39 | VLED/NC | LED Anode |
| 20 | NC | Non Connection | 40 | -- | (Not specified) |
Note: Pins 35 (PWM) and 36 (LED_EN) are used for external backlight driver control. Pins 38 and 39 (VLED) are for the backlight anode supply from the external driver.
