LS1025I01-L-V1: 10.25-Inch FHD TFT LCD Module, 1920×720 Resolution, LVDS Interface, 1000 cd/m² High Brightness (Max), 16.7M Colors, Normally Black Display

LS1025I01-L-V1: 10.25-Inch FHD TFT LCD Module, 1920×720 Resolution, LVDS Interface, 1000 cd/m² High Brightness (Max), 16.7M Colors, Normally Black Display

Product Subtitle / Keywords

10.25 Inch Display, 1920(H) × 720(V) FHD Resolution, a-Si TFT LCD Panel, 2 Port LVDS Interface, RGB Vertical Stripe Pixel Arrangement, 16.7M (8bit) Display Colors, Color Gamut NTSC 70% Min, Normally Black Display Mode, Active Area 243.648(H) × 91.368(V) mm, Outline Dimension (Without PCBA) 253.19(H)×106.05(V)×6.73(D) mm, Surface Treatment HC (Hard Coating), Surface Hardness 3H, Logic Power Consumption 0.5W (Max), Backlight Forward Voltage (Typ.) 21V, Backlight Current 360mA (90mA×4), Product Spec Version Ver 1.0, Date 2023/03/27, Lesson Smart Display Technology Co., Ltd.

1. Executive Summary & Product Positioning

The LS1025I01-L-V1, developed by Lesson Smart Display Technology Co., Ltd. (立信(万安)智显科技有限公司), is a 10.25-inch TFT Liquid Crystal Display module. The matrix uses a-Si Thin Film Transistor as a switching device. This TFT LCD has a 10.25 inch diagonally measured active display area with FHD resolution (1920 horizontal by 720 vertical pixels array). All input signals are LVDS interface compatible.

This product specification (Revision 1.0, dated 2023-03-27) serves as the definitive technical document, defining the module's general description (including features like 2 Port LVDS interface, 16.7M color depth, 70% color gamut, and RoHS compliance), general specifications (including active area, pixel pitch, display mode, outline dimensions, surface treatment, and logic power consumption), absolute maximum ratings, electrical characteristics (including pin assignments for the 48-pin connector, LVDS input/output timing, input power specifications, power on/off sequence), backlight specifications, optical characteristics, reliability test items, and package specifications.

This document provides the core parameters necessary for system integration into 10.25-inch automotive or industrial display applications requiring an FHD resolution with an ultra-wide aspect ratio. The unequivocal recommendation for engineers is to strictly adhere to the specified power supply voltage (VCC = 3.3V), the 2-port LVDS interface characteristics, the critical power-on/off sequence (VCC → LVDS → Backlight), and the absolute maximum ratings, especially the backlight forward current (360mA) to ensure reliable performance and prevent damage.

2. Detailed Product Overview & Architecture

• Core Technology: TFT Liquid Crystal Display using a-Si (amorphous Silicon) Thin Film Transistors as switching devices. All input signals are LVDS (Low Voltage Differential Signaling) interface compatible.
• Display Resolution: FHD (Full High Definition) resolution: 1920(H) × 720(V) pixels. This provides an ultra-wide 8:3 aspect ratio, ideal for automotive dashboard or infotainment displays.
• Display Mode: Normally Black, meaning the display is black when no voltage is applied.
• Pixel Arrangement: RGB Vertical Stripe, a standard color filter arrangement.
• Display Colors: 16.7M (8bit) color depth. The color gamut is specified as NTSC 70% min.
• Module Construction: The specification includes an outline dimension for both "Without PCBA" and "With PCBA" configurations:
  • Without PCBA: 253.19±0.3(H)*106.05±0.3(V)*6.73±0.25 (mm)
  • With PCBA: 253.19±0.3(H)*106.05±0.3(V)*8.83±0.3 (mm)
  This suggests the module is available as an Open Cell or with a control PCB attached.
• Interface Type: 2 Port LVDS interface. This is a high-speed, low-power interface for transmitting video data. The Odd and Even pixel data are transmitted on separate LVDS channels.
• Power Architecture: A single logic power supply (VCC) of 3.3V is required for the LCD drive logic. The backlight is powered separately through dedicated LED pins (LEDA/LEDK).
• Backlight: White LED backlight composed of a specific number of LEDs. Based on the electrical characteristics (Forward Voltage 19.8V~23.1V, Current 360mA), it is likely a 6S4P configuration (6 series, 4 parallel). An external constant-current LED driver is required.

3. Exhaustive Technical Specifications

3.1 General & Mechanical Specifications (Taken from Table 1)

3.2 Input Power Specifications (Taken from Table in Section 3.4)

Conditions: VCC = 3.3V, FV = 60Hz, Mosaic Pattern.

Note: The VCC current (IVCC) is measured under VCC=3.3V, FV=60Hz, and a 10×8 mosaic pattern. The Rush Current (Irush) is measured when the Trush (rise time) is 0.5ms.

3.3 Interface & Pin Description (48-Pin Connector)

The module uses a 48-pin connector for the LVDS interface, power, and control signals. Key signals from the pin assignment list include:

Important Notes from the specification:

• 2-Port LVDS: The module features an Odd/Even pixel data structure, where odd and even pixel data are transmitted on separate LVDS channels (ORX and ERX). This requires a host processor that supports a 2-port LVDS output.
• Serial Interface (SPI/I2C): The presence of CSB, SCL, SDAI, and SDAO pins indicates that the internal TCON (Timing Controller) can be configured via a serial interface (likely SPI or I2C). This may be used for advanced settings such as gamma correction, voltage trimming, etc.
• FAULT Signal: Pin 31 outputs a FAULT signal. This is an open-drain (or standard CMOS) output that goes LOW in an abnormal condition (e.g., backlight failure, TCON error). This can be used by the system to diagnose display issues.
• RESET and STBYB: These control signals adhere to a specific voltage divider circuit on the connector. The specification notes (Note 5) that because there are voltage dividers (350kΩ pull-up/down resistors to VCC or GND via Schmitt triggers), the designer must pay special attention to the I/O structure when interfacing with the host.

3.4 Backlight Specifications (From Section 3.7 Backlight LED)

Note: The backlight driving condition is specified as 90 mA per string × 4 strings = 360 mA (constant current). The LED voltage (Vf) is from 19.8V to 23.1V with a typical value of 21V at 25°C. The total backlight power is therefore approximately 7.56W (21V × 360mA).

3.5 Power ON/OFF Sequence (From Section 3.5)

The specification provides a critical power sequence with timing diagrams. The key points are:

• VCC Power Up: VCC (Logic) voltage must be applied first.
• LVDS Signal: After VCC is stable, the LVDS signals, RESET, and STBYB must be applied.
• Backlight: The backlight must be turned ON only after the LVDS signals, RESET, and STBYB are valid.
• Key Timing:
  • From VCC to LVDS valid: > 20ms
  • STBYB & RESET stable before backlight: > 20ms
  • Backlight ON after LVDS valid: > 0ms (10msec recommended, with 100u sec minimum)
• Power Off: The reverse sequence must be followed: Backlight OFF → LVDS/STBYB/RESET OFF → VCC OFF.
• Critical Rule: Interface signals from any system shall be in a Hi-Z state or at a low level when VCC voltage is off.

3.6 Reliability Test Conditions (From Section 4)

Note: These reliability test conditions are specifically for the module itself. They indicate that the module can withstand extended high-temperature operation (85°C for 500hrs) and wide temperature swings, which is a strong indication for automotive or industrial applications.

3.7 LVDS Data Mapping

The specification includes LVDS data mapping diagrams for both Odd and Even pixels, showing how the RGB data (R[7:0], G[7:0], B[7:0]) and control signals (DE, VS, HS) are distributed across the 4 LVDS data pairs (LVDS0-LVDS3) for each port. This is essential for correctly formatting the video data in the host processor's LVDS transmitter.

4. Application Guidelines & Critical Notes

Intended Use

• 10.25-inch automotive display applications (e.g., instrument clusters, center-stack infotainment displays, head-up displays). The ultra-wide aspect ratio (8:3) is a strong indicator for this use case.
• Industrial displays requiring a high brightness and wide temperature range.
• Any application requiring an FHD (1920×720) resolution in an ultra-wide format with LVDS interface.

Critical Design Considerations

1. Power Supply (VCC = 3.3V): The logic power supply is a single 3.3V rail. The typical peak current is 150mA (max), but the inrush current can reach up to 1A during power-up. The power supply must be capable of sustaining this inrush without dropping below the minimum VCC level. The allowable ripple voltage is 200mV max, so a low-noise LDO or a clean switching regulator is recommended.
2. 2-Port LVDS Interface: The module uses a 2-port (Odd/Even) LVDS interface. This means the host processor's LVDS transmitter must support this dual-port mode. The total pixel clock frequency required for 1920×720 @ 60Hz is approximately 89 MHz, so a 2-port configuration effectively halves the clock per port to ~45 MHz, making it easier to achieve signal integrity.
3. External Backlight Driver (360mA @ 21V): The backlight consists of 4 parallel LED strings, each drawing 90mA. This requires an external boost-type constant-current LED driver capable of delivering 360mA at a forward voltage between 19.8V and 23.1V (Typ 21V). The 4 LEDK pins (Cathode 1-4) should be connected to the current sink outputs of the driver, allowing for independent current balancing per string. The total backlight power is approximately 7.56W.
4. Critical Power-On/Off Sequence: The module has a strict power-on and power-off sequence. The most critical rule is: Backlight must be turned on only after the LVDS signals, RESET, and STBYB are valid, and must be turned off before these signals are de-asserted. Violating this sequence can cause permanent damage to the LCD panel or backlight. The timing parameters require a minimum of 20ms delay between VCC stable and LVDS valid, and another >0ms delay before turning on the backlight.
5. Serial Interface Configuration (CSB, SCL, SDAI, SDAO): The module has a serial interface for configuring the TCON. This is typically used for factory calibration or advanced display tuning. The designer should ensure the host processor can communicate with the module via this interface (likely SPI or I2C). The SDAO pin (data output) suggests the module can also send status information back to the host.
6. FAULT Signal Monitoring: The FAULT signal (Pin 31) can be connected to a GPIO on the host processor to detect abnormal conditions (e.g., backlight failure, TCON error). This can be used to display an error message or shut down the system gracefully.
7. ESD and I/O Protection: The note about voltage dividers on RESET and STBYB pins means these signals have internal pull-up resistors to VCC. The designer must ensure the host's I/O pins are compatible with these input structures (e.g., open-drain output with external pull-up, or push-pull output). The specific values (350kΩ) suggest a relatively weak internal pull-up, so an external strong pull-up may be needed for fast rise times.
8. Mechanical Integration Options (With/Without PCBA): The module can be ordered either "Without PCBA" (thinner at 6.73mm) or "With PCBA" (thicker at 8.83mm). The "With PCBA" version includes a control PCB that may integrate the LED driver and TCON, simplifying the system design. The designer must choose the appropriate version based on their system architecture.
9. Wide Operating Temperature Range: Based on the reliability test conditions, the module supports operating temperatures from -30°C to +85°C and storage from -40°C to +90°C. This makes it highly suitable for automotive environments.
10. Package Specifications: The document describes the packing method, including a specific number of trays and cartons (960 pcs per pallet). This is useful for logistics planning.

Handling & Compliance

• Observe standard ESD precautions during handling and assembly. The backlight uses high-frequency circuitry that is sensitive to ESD.
• The module contains fragile glass – handle with care. Avoid mechanical stress on the active area or FPC.
• Do not attempt to disassemble or modify the LCD module.
• The document describes a Green product (RoHS & Halogen free product) in the Features section.
• Follow the recommended storage conditions to prevent damage from moisture, static, and extreme temperatures.

5. Conclusion & Design-In Support

The LS1025I01-L-V1 specification details a highly specialized, high-performance 10.25-inch ultra-wide (1920×720) FHD TFT LCD module with a 2-port LVDS interface, designed for automotive and industrial applications requiring wide temperature ranges, high brightness, and excellent reliability.

Key Strengths

• Ultra-Wide Aspect Ratio (8:3): Perfect for automotive dashboard, infotainment, and other applications requiring a wide, panoramic display.
• Robust Temperature Range: Operates from -30°C to +85°C, making it suitable for harsh environments.
• 1,000 cd/m² High Brightness (Max): Ensures excellent readability in direct sunlight (common in automotive cockpits).
• 2-Port LVDS Interface: Reduces the effective pixel clock frequency, aiding in signal integrity over longer cables.
• Built-in Diagnostic (FAULT) and Serial Configuration Port: Provides advanced system integration capabilities.
• Multiple Mechanical Configurations (With/Without PCBA): Offers design flexibility.

Main Design Focus

• The critical design tasks are implementing a well-sequenced power supply (3.3V logic, external LED driver 360mA at 21V) with strict adherence to the power-on/off timing (Backlight ON only after LVDS valid), configuring the host processor's LVDS transmitter for 2-port (Odd/Even) operation at the correct pixel clock for 1920×720, and designing the mechanical housing to accommodate the chosen module variant (with or without PCBA).
• Supporting requirements: Implement the serial interface (SPI/I2C) for optional TCON configuration. Connect the FAULT signal to a system monitoring GPIO. Ensure the host's I/O structure is compatible with the internal pull-up resistors on the RESET/STBYB pins. Validate the overall system against the provided LVDS data mapping and timing diagrams.

This module is an ideal choice for engineers designing automotive displays that demand high reliability, wide temperature range, and an ultra-wide format with FHD resolution.