LS101I28-L-V1: 10.1-Inch TFT LCD Module, WSVGA Resolution (1024×600), LVDS Interface, High Brightness, 850 cd/m² Typical Luminance
Product Subtitle / Keywords
10.1 Inch Display, 1024×600 WSVGA Resolution, Transmissive Color Active Matrix TFT LCD, Amorphous Silicon TFT as Switching Device, COG+FPC+B/L Module Type, Normally Black Display Mode, Free Viewing Direction, RGB Vertical Stripe Format, High Brightness 850 cd/m² (Typ), Contrast Ratio 800:1 (Typ), Hard Coating Surface, LVDS Interface, White LED Backlight, 20-Pin FPC Connector, Operating Temp -20~70°C, Storage Temp -25~75°C, Lesson Smart Display Technology Co., Ltd
1. Executive Summary & Product Positioning
The LS101I28-L-V1, developed by Lesson Smart Display Technology Co., Ltd. (立信(万安)智显科技有限公司), is a 10.1-inch transmissive type color active matrix liquid crystal display (LCD) which uses amorphous thin film transistor (TFT) as switching devices. This product is composed of a TFT LCD panel, driver ICs and a backlight unit.
This product specification (Revision 1.0) serves as the definitive technical document, defining the module’s general description (including a 10.1-inch diagonal display with WSVGA resolution of 1024 horizontal by 600 vertical pixel array), features (Normally Black display mode, free viewing direction, LVDS interface, high brightness), pin description (20-pin connector), block diagram, electrical characteristics (absolute maximum ratings, power sequence), backlight specifications (optical characteristics), and reliability/ESD test conditions.
The document provides the core parameters necessary for system integration into high-brightness industrial and commercial display applications. The unequivocal recommendation for engineers is to strictly adhere to the electrical specifications (especially the power supply voltage, LED_EN and PWM signal levels), the power on/off sequence, and the mechanical tolerances described herein to ensure reliable performance and compatibility.
2. Detailed Product Overview & Architecture
- Core Technology: Transmissive type color active matrix liquid crystal display (LCD) using amorphous thin film transistor (TFT) as switching devices.
- Display Resolution: WSVGA: 1024 RGB(H) × 600(V) pixel array.
- Pixel Structure: RGB Vertical Stripe format.
- Display Mode: Normally Black.
- Module Construction: COG+FPC+B/L (Chip-On-Glass + Flexible Printed Circuit + Backlight).
- Interface Type: LVDS (Low-Voltage Differential Signaling) interface, using differential data pairs (RXIN0 to RXIN3) and a differential clock pair (RX_CLK).
- Display Colors: The number of colors is not explicitly listed in the features table, but the LVDS interface supports up to 16.7M colors (8-bit) or 262k colors (6-bit).
- Backlight: White LED backlight, providing a high typical luminance of 850 cd/m².
- Surface Treatment: Hard Coating for improved durability and scratch resistance.
- Viewing Direction: “Free” — optimized for all directions (Full Viewing Angle).
3. Exhaustive Technical Specifications
3.1 Mechanical & Physical Specifications
| Parameter | Specification | Unit |
|---|---|---|
| Module Model | LS101I28-L-V1 | - |
| LCD Size (Diagonal) | 10.1 | inch |
| Number of Pixels | 1024RGB(H) × 600(V) (WSVGA) | Pixels |
| Active Area | 222.72 (W) × 125.28 (H) | mm |
| Pixel Pitch | 0.2175 (H) × 0.2088 (H) | mm |
| Outline Dimension | 235.0 (W) × 143.0 (H) × 5.0 (T) | mm |
| Display Mode | Normally Black | - |
| Viewing Direction | Free | - |
| Display Format | RGB vertical stripe | - |
| Luminance (MIN / TYP) | 750 / 850 | cd/m² (nit) |
| Contrast Ratio (TYP) | 800 : 1 | - |
| Surface Treatment | Hard Coating | - |
| Interface | LVDS | - |
| Backlight | White LED | - |
| Module Type | COG+FPC+B/L | - |
| Operating Temperature | -20 ~ +70 | °C |
| Storage Temperature | -25 ~ +75 | °C |
| Supplier | 立信(万安)智显科技有限公司 (Lesson Smart Display Technology Co.,Ltd) | - |
| Document Revision | Revision 1.0 | Released 2021-09-26 | - |
3.2 Electrical & Interface Specifications
3.2.1 Absolute Maximum Ratings
| Item | Symbol | Min. | Max. | Unit |
|---|---|---|---|---|
| Power voltage (Digital) | VDD-VSS | -0.5 | 4.0 | V |
| Power voltage (LED backlight) | VLED-VSS | -0.5 | 12 | V |
3.2.2 Pin Description (20-pin FPC Connector - CN1)
The module uses a 20-pin FPC connector. Key signals include:
| Pin No. | Symbol | I/O | Function |
|---|---|---|---|
| 1, 2 | VDD | P | Power supply VDDIN=3.3V |
| 3 | LED_EN | I | Power supply VDDIN(3.3~5.0V) for LED driver |
| 4 | GND | P | Ground |
| 5, 6 | RXIN0N / RXIN0P | I | LVDS differential data input (Lane 0) |
| 7 | GND | P | Ground |
| 8, 9 | RXIN1N / RXIN1P | I | LVDS differential data input (Lane 1) |
| 10 | GND | P | Ground |
| 11, 12 | RXIN2N / RXIN2P | I | LVDS differential data input (Lane 2) |
| 13 | GND | P | Ground |
| 14, 15 | RX_CLKN / RX_CLKP | I | LVDS differential clock input |
| 16 | GND | P | Ground |
| 17, 18 | RXIN3N / RXIN3P | I | LVDS differential data input (Lane 3) |
| 19 | PWM | I | Backlight brightness: apply 0.7V to 1.4V DC voltage signal |
| 20 | VLED | P | Power supply VLED=5~12V (Typ.) |
Note: I/O Definitions: I = Input, O = Output, P = Power. The module uses 4 LVDS data lanes (Lane 0, 1, 2, 3), indicating support for 8-bit color depth (or optional 6-bit if some lanes are unused).
3.2.3 Power On/Off Sequence
An incorrect power sequence can damage the device. The specified sequence from the block diagram summary is:
- Power On: VDD (3.3V) → LVDS Signals → Source Output = 0V → Backlight (via LED_EN). The timing diagram in the spec shows VDD, VGL, VGH, VCOM, Source output, and BL_EN states.
- Power Off: Backlight off → Source output = 0V → VGH → VGL → VDD. The timing diagram shows the reverse order.
Strict adherence to the timing diagram is required to prevent latch-up and permanent damage.
3.2.4 Backlight Specifications
The backlight uses a White LED array with internal current setting (IF=140mA).
| Item | Symbol | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Forward voltage | VF | 17.6 | 18 | 19.1 | V |
| Forward current | If | 55 | 60 | 65 | mA |
| PWM Signal Voltage (High) | PWM_h | 2.0 | 3.3 | 3.6 | V |
| PWM Signal Voltage (Low) | PWM_I | 0 | - | 0.5 | V |
| Output PWM frequency | PWM_f | - | 200 | 20K | Hz |
| LED enable Voltage (High) | EN_h | 2.6 | 3.3 | 3.6 | V |
| LED enable Voltage (Low) | EN_I | 0 | - | 0.4 | V |
Note: The backlight has a unique brightness control method. Pin 19 (PWM) accepts a DC voltage signal (0.7V to 1.4V) to adjust backlight brightness. A dedicated PWM signal is used internally. The VLED power (Pin 20, 5~12V) and LED_EN (Pin 3, 3.3~5V) are provided to power the internal LED driver.
3.2.5 Input Timing Table (DE Mode)
The specification includes two timing modes: DE mode and HV mode. Key parameters for DE mode are:
| Parameter | Symbol | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| DCLK frequency | FCLK | 40.8 | 51.2 | 71 | MHz |
| Horizontal display area | Thd | 1024 | 1024 | 1024 | DCLK |
| HSD period | th | 1114 | 1344 | 1464 | DCLK |
| HSD blanking | Thb + Thfp | 90 | 320 | 376 | DCLK |
| Vertical display area | Tvd | 600 | 600 | 600 | TH |
| VSD period | Tv | 610 | 635 | 800 | TH |
| VSD blanking | Tvbp + Thfp | - | 24 | - | TH |
Note: The HV mode timing is also specified in the document. Typical clock frequency is 51.2 MHz.
3.3 Optical Characteristics
The specification defines the optical characteristics, including:
- Contrast Ratio: 800 : 1 (TYP).
- Luminance: 750 cd/m² (MIN) / 850 cd/m² (TYP).
- White Chromaticity (X/Y): Defined with typical values (X=0.310, Y=0.330) and ranges (X: 0.260-0.360, Y: 0.280-0.380).
- Color Gamut (NTSC ratio): TBD (Not yet specified).
- Luminance Uniformity (U): Defined as Lmin / Lmax, with specific measurement points across the active area.
3.4 Reliability and ESD
The module is tested under the following conditions:
| Test Item | Conditions |
|---|---|
| Electro Static Discharge Test (Non-Operation) | 150pF, 330Ω, Contact ±4KV, Air: ±8KV (Note 1) |
| Electro Static Discharge Test (Non-Operation) | 200pF, 0Ω, ±200V Contact test (Note 2) |
4. Application Guidelines & Critical Notes
Intended Use
- Standard 10.1-inch industrial and commercial display applications requiring high brightness.
- Outdoor or high-ambient-light applications where the 850 cd/m² (Typ) luminance provides readability.
- Applications requiring a WSVGA (1024×600) resolution display with a standard LVDS interface.
Critical Design Considerations
- High Brightness (850 cd/m² Typ): This is the stand-out feature of this module — a typical luminance of 850 cd/m² makes it suitable for direct sunlight readability. The backlight driver must handle the associated power, with a VLED supply of 5~12V (Typ. per the pin table) and a total LED current of approximately 60mA (per the backlight spec).
- Unique Backlight Brightness Control (PWM Pin): The backlight brightness is controlled via Pin 19 (PWM) using a DC voltage signal (0.7V to 1.4V), not a standard PWM signal. The internal circuit converts this voltage to a PWM duty cycle. The host system must provide a stable, controllable DC voltage within this range for dimming.
- LVDS Interface with 4 Lane Support: The module uses 4 LVDS data lanes (Lane 0 through 3) plus a clock lane. This configuration supports 8-bit (16.7M) color depth natively. The host LVDS transmitter must be configured for 4-lane, 8-bit mode.
- Multi-Voltage Power Supply Requirements: The module requires:
- VDD (Pins 1,2): 3.3V digital power for the logic.
- VLED (Pin 20): 5~12V (Typ.) power for the LED backlight driver.
- LED_EN (Pin 3): 3.3~5.0V enable signal for the internal LED driver.
- Critical Power Sequencing: Strictly follow the Power-On/Off sequence as defined. The backlight should only be enabled after the LVDS signals and panel power are stable. The spec diagram shows VCOM, VGH, VGL, and source output sequencing that must be adhered to.
- External Backlight Driver? The module appears to include an internal LED driver that is controlled by the PWM pin and powered by VLED and LED_EN. The backlight spec shows internal current of IF=140mA (per internal circuit diagram). This simplifies external design.
- Free Viewing Direction: The “Free” viewing direction makes this display suitable for applications where users view the screen from various angles.
- Hard Coating Surface: Adds durability and scratch resistance, suitable for touch applications or industrial environments.
- Operating Temperature Range: This module supports a wide industrial temperature: -20°C to +70°C (operating) and -25°C to +75°C (storage).
Handling & Compliance
- Observe standard ESD precautions during handling and assembly. The module is tested to ±4KV (Contact) and ±8KV (Air).
- The module contains fragile glass and a precision FPC – handle with care.
- Avoid bending the FPC sharply, especially near the connector interface or glass edge.
- Do not attempt to disassemble or modify the LCD module.
- All NC (No Connection) pins should be left open.
5. Conclusion & Design-In Support
The LS101I28-L-V1 specification details a high-brightness 10.1-inch WSVGA TFT display module with an LVDS interface, a unique DC voltage-based brightness control, a “Free” viewing direction, and a Hard Coating surface — an excellent choice for applications requiring strong sunlight readability.
Key Strengths
- Ultra-High Brightness (850 cd/m² Typ): Outstanding for outdoor and high-ambient-light environments.
- Unique Analog Brightness Control: DC voltage-based control (0.7V to 1.4V) provides smooth, flicker-free dimming.
- Integrated LED Driver: Simplifies backlight design by providing dedicated power (VLED, LED_EN) and control (PWM) pins.
- Free Viewing Direction: Wide viewing angle suitable for public-facing and multi-user displays.
- Hard Coating: Durable surface for touch and industrial use.
Main Design Focus
- The critical design task is providing the correct power supplies (VDD=3.3V, VLED=5-12V, LED_EN=3.3-5V) and implementing the unique DC voltage brightness control (0.7V to 1.4V on Pin 19).
- Supporting requirements: Configure the host LVDS transmitter for 4-lane, WSVGA (1024×600) resolution at a typical clock frequency of 51.2 MHz. Follow the power on/off sequence strictly. Use DAC or analog control circuit for the PWM pin for dimming.
This module is a standout choice for engineers needing a sunlight-readable, high-brightness 10.1-inch display with a robust LVDS interface and unique analog dimming control.
