LS070T21-R-V1: 7.0-Inch a-Si TFT LCD Module, 1024×600 Resolution, 50-Pin, IPS Display, Parallel RGB 24-bit Interface, Transmissive, Normally White
Product Subtitle / Keywords
7.0 Inch Display, 1024(RGB)×600 Resolution, Active Matrix a-Si TFT-LCD Module, IPS (In-Plane Switching) Viewing Direction, Parallel RGB 24-bit Interface, 50-Pin Connector, COG+FPC+B/L, Display Colors 16.7M, Display Mode: Normally White, Backlight Type: 3*9 chips white LED (27 chips), LCM Luminance: 320 cd/m² (Typ), Contrast Ratio: 200 (Typ), Response Time: 25 ms (Typ), Input Voltage (Digital Power Supply): 3.0-3.6V Typ 3.3V, AVDD (Analog Power): 8.8-9.8V Typ 9.8V, VGH: 16-17V Typ 17V, VGL: -7.4 to -6.2V Typ -6.8V, VCOM: 3.3-3.8V Typ 3.6V, Backlight Forward Voltage: 9.0-9.6V Typ 9.2V, Backlight Forward Current: 180mA, DCLK Frequency: 45-57 MHz Typ 51.2 MHz, ROHS Compliant, Lesson Smart Display Technology Co., Ltd
1. Executive Summary & Product Positioning
The LS070T21-R-V1, developed by Lesson Smart Display Technology Co., Ltd. (立信(万安)智显科技有限公司), is a 7.0-inch color active matrix TFT-LCD module incorporating amorphous silicon TFT (Thin Film Transistor).
This product specification (Revision 1.0, dated 2016-04-20) serves as the definitive technical document, defining its general specifications (including 1024×600 pixels and ROHS compliance), absolute maximum ratings, electrical characteristics (including all critical voltage rails and backlight characteristics), interface pin connections, timing characteristics, electro-optical characteristics, reliability testing (including MTBF of 50000 hours and drop test), and inspection standards.
The document provides the core parameters necessary for system integration into embedded display applications requiring a standard 7.0-inch display with a parallel RGB 24-bit interface and IPS viewing technology. 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: Color active matrix LCD module incorporating amorphous silicon TFT (Thin Film Transistor). It is composed of a color TFT-LCD panel, driver IC, FPC and a back light unit.
- Display Type: IPS (In-Plane Switching) viewing direction, Normally White display mode.
- Display Format: Graphic 1024(RGB) × 600 pixel array (WSVGA resolution).
- Number of Colors: 16.7M.
- Module Construction: COG+FPC+B/L (Chip-On-Glass + Flexible Printed Circuit + Backlight).
- Interface Type: Parallel RGB 24-bit Interface.
- Pin Count: 50-pin connector.
- Backlight Type: 3*9 chips white LED (27 chips total).
- LCM Luminance: 320 cd/m² (Typ).
- Regulatory Compliance: This product accords with RoHS environmental criterion.
3. Exhaustive Technical Specifications
3.1 General Specifications
| Module Model | LS070T21-R-V1 |
| LCD Size (Diagonal) | 7.0 inch |
| Resolution (Number of Pixels) | 1024(RGB) × 600 |
| Number of Colors | 16.7M |
| Viewing Direction | IPS |
| Display Mode | Normally White |
| Module Type | COG+FPC+B/L |
| Backlight Type | 3*9 chips white LED (27 chips) |
| Interface Type | Parallel RGB 24-bit |
| LCM Luminance | 320 cd/m² (Typ) |
| Response Time (Tr+Tf) | 25 ms (Typ) |
| Contrast Ratio | 200 (Typ) |
| Input voltage (Digital) | 3.3V (Typ) |
| PIN Count | 50 |
| Supplier | 立信(万安)智显科技有限公司 (Lesson Smart Dispaly Technology Co.,Ltd) |
| Document Revision / Date | Revision 1.0 / 2016-04-20 |
3.2 Electrical & Interface Specifications
3.2.1 Absolute Maximum Ratings
The following are maximum values which, if exceeded, may cause faulty operation or damage to the unit.
| Item | Symbol | Min | Max | Unit |
|---|---|---|---|---|
| Digital Supply Voltage | VDD VDD-LVDS | -0.3 | 5 | V |
| Analog Supply Voltage | AVDD | -0.5 | 15 | V |
| Gate On Voltage | VGH | -0.3 | 40 | V |
| Gate Off Voltage | VGL | -20 | 0.3 | V |
| Gate On-Gate Off Voltage | VGH-VGL | -0.3 | 40 | V |
Note: If users use the product out of the environment operation range (temperature and humidity), it will have visual quality concerns.
3.2.2 Electrical Characteristics (Typical Operation Conditions)
| Item | Symbol | Min. | TYP | Max. | Unit |
|---|---|---|---|---|---|
| Digital Power Supply Voltage For LCD | VDD | 3.0 | 3.3 | 3.6 | V |
| Analog Power Supply Voltage | AVDD | 8.8 | 9.8 | 10.6 | V |
| TFT Gate on voltage | VGH | 16 | 17 | 18 | V |
| TFT Gate off voltage | VGL | -7.4 | -6.8 | -6.2 | V |
| Common Voltage | VCOM | 3.3 | 3.6 | 3.8 | V |
| Logic Input Voltage (H) | VIH | 0.7*DVDD | -- | DVDD | V |
| Logic Input Voltage (L) | VIL | GND | -- | 0.3*DVDD | V |
3.2.3 Backlight Characteristics
| Item | Symbol | Min | Typ | Max | Unit | Condition |
|---|---|---|---|---|---|---|
| Forward voltage | Vf | 9.0 | 9.2 | 9.6 | V | If=180mA |
| Luminance | Lv | 320 | 350 | - | cd/m2 | If=180mA |
| Number of LED | -- | 27 | 27 | 27 | Piece | -- |
| Connection mode | P | 3 chips serial *9 | 3 chips serial *9 | 3 chips serial *9 | -- | -- |
3.2.4 Interface Pin Connections (50-pin Connector)
The module uses a 50-pin interface with a Parallel RGB 24-bit interface including power, control, and data signals.
| Pin No. | Symbol | Function |
|---|---|---|
| 1,2 | VLED+ | Power for LED backlight (Anode) |
| 3,4 | VLED- | Power for LED backlight (Cathode) |
| 5 | GND | Power ground |
| 6 | VCOM | Common Voltage |
| 7 | DVDD | Digital Power |
| 8 | MODE | DE/SYNC mode select. Normally pull high H: DE mode. L: HSD/VSD mode |
| 9 | DE | Data Enable signal. |
| 10 | VSD | Vertical sync input. Negative polarity |
| 11 | HSD | Horizontal sync input. Negative polarity |
| 12-19 | B7-B0 | Blue Data |
| 20-27 | G7-G0 | Green Data |
| 28-35 | R7-R0 | Red Data |
| 36 | GND | Ground |
| 37 | DCLK | Clock signal |
| 38 | GND | Display on/off |
| 39 | SHLR | Left or Right Display Control |
| 40 | UPDN | Up / Down Display Control |
| 41 | VDDG | Positive Power for TFT |
| 42 | VEEG | Negative Power for TFT |
| 43 | AVDD | Analog Power |
| 44 | RSTB | Global reset pin. Active low to enter reset state. Suggest to connecting with an RC reset circuit for stability. Normally pull high. (R=10KΩ, C=1 μF) |
| 45 | NC | Not connect |
| 46 | VCOM | Common Voltage |
| 47 | DITH | Dithering setting DITH="H" 8bit resolution(last 2 bit of input data truncated) DITH="L" 6bit resolution(default setting) |
| 48 | GND | Power ground |
| 49,50 | NC | Not connect |
3.2.5 Timing Characteristics (DE Mode)
| ITEM | SYMBOL | MIN. | TYP. | MAX. | UNIT |
|---|---|---|---|---|---|
| Dot Clock | 1/tCLK | 45 | 51.2 | 57 | MHz |
| DCLK Pulse Duty | Tcwh | 40 | 50 | 60 | % |
| Horizontal Total Time | tH | 1324 | 1344 | 1364 | tCLK |
| Horizontal Effective Time | tHA | 1024 | 1024 | 1024 | tCLK |
| Horizontal Blank Time | tHB | 300 | 320 | 340 | tCLK |
| Vertical Total Time | tV | 625 | 635 | 645 | tH |
| Vertical Effective Time | tVA | 600 | 600 | 600 | tH |
| Vertical Blank Time | tVB | 25 | 35 | 45 | tH |
3.2.6 Clock and Data Timing Diagram Specifications
| Parameter | Symbol | Min. | Typ. | Max. | Unit | Condition |
|---|---|---|---|---|---|---|
| DVDD Power On Slew Rate | TPOR | - | - | 20 | ms | From 0V to 90% DVDD |
| RSTB Pulse Width | TRst | 50 | - | - | us | DCLK=65MHz |
| DCLK Cycle Time | Tcph | 14 | - | - | ns | - |
| DCLK Pulse Duty | Tcwh | 40 | 50 | 60 | % | - |
| VSD Setup Time | Tvst | 5 | - | - | ns | - |
| VSD Hold Time | Tvhd | 5 | - | - | ns | - |
| HSD Setup Time | Thst | 5 | - | - | ns | - |
| HSD Hold Time | Thd | 5 | - | - | ns | - |
| Data Setup Time | Tdsu | 5 | - | - | ns | D0[7:0],D1[7:0],D2[7:0] to DCLK |
| Data Hold Time | Thd | 5 | - | - | ns | D0[7:0],D1[7:0],D2[7:0] to DCLK |
| DEN Setup Time | Tesu | 5 | - | - | ns | - |
| DEN Hold Time | Tehd | 5 | - | - | ns | - |
3.2.7 Power Sequence
Power On: DVDD → AVDD/VGL → VGH → Video & Logic Signal → Backlight
Power Off: Backlight → Video & Logic Signal → VGH → AVDD/VGL → DVDD
Critical timing constraints: 0 < T1 ≤ 10ms, T2 > 0ms, T3 > 20ms, T4 > 0ms, T5 > 10ms, 0 < T6 ≤ 10ms, T7 > 0ms, T8 > 0ms, T9 > 0ms, T10 > 0ms, 0 < T11 ≤ 10ms, T12 ≥ 200ms, T13 ≥ 200ms.
3.3 Electro-Optical Characteristics
| ITEM | SYMBOL | CONDITION | MIN. | TYP. | MAX. | UNIT |
|---|---|---|---|---|---|---|
| Panel Transmittance | T | θ = 0° | 3.9 | 4.2 | -- | % |
| Luminance | L | θ = 0° | 320 | 350 | -- | cd/m2 |
| Luminance Uniformity | YU | 9points | 75 | 80 | -- | % |
| Contrast Ratio | CR | Point-5 | -- | 200 | -- | - |
| Response Time | Rr+Tf | Point-5 | -- | 25 | -- | ms |
3.4 Reliability Testing
3.4.1 MTBF (Mean Time Between Failures)
The LCD module shall be designed to meet a minimum MTBF value of 50000 hours with normal. (25°C in the room without sunlight).
3.4.2 Test Conditions
| No. | Test Item | Test condition | Criterion |
|---|---|---|---|
| 9 | Drop Test (package state) | 800mm, concrete floor, 1corner, 3edges, 6 sides each time | 1. After testing, cosmetic and electrical defects should not happen. 2. the product should remain at initial place 3 Product uncovered or package broken is not permitted. |
| 10 | Electro Static Discharge Test (non-operation) | 150pF, 330Ω, Contact: ±4KV, Air: ±8KV / 200pF, 0Ω, ±200V contact test | IEC61000-4-2: 2001 GB/T17626.2-2006 |
3.5 Inspection Standards
Environmental conditions for inspection: Room temperature: 20±3°C ; Humidity: 65±20%RH
External visual inspection: With a single 20-watt fluorescent lamp as the light source, the inspection was in the distance of 30cm or more from the LCD to the inspector's eyes.
Classification of defects: Major defect (may substantially degrade usability) and Minor defect (does not substantially degrade usability).
4. Application Guidelines & Critical Notes
Intended Use
- Industrial control panels and human-machine interfaces (HMIs) requiring a standard 7.0-inch display with IPS viewing angles.
- Embedded systems requiring a 1024x600 resolution display with a parallel RGB 24-bit interface.
Critical Design Considerations
- IPS Technology: This module features IPS (In-Plane Switching) viewing direction, providing excellent wide viewing angles and color consistency. The display mode is Normally White.
- Power Supply Rails: Provide stable voltages: VDD (3.3V Typ), AVDD (9.8V Typ), VGH (17V Typ), VGL (-6.8V Typ), and VCOM (3.6V Typ). These are critical for proper TFT operation.
- Backlight Driving: The backlight uses 27 white LED chips (3 chips serial * 9 groups). A constant-current LED driver is required with an IF = 180 mA and VF = 9.2V (Typ).
- Power Sequence: Strictly follow the specified power on/off sequence: Power On: DVDD → AVDD/VGL → VGH → Video & Logic Signal → Backlight. Incorrect sequencing may damage the module. Timing constraints for T1 through T13 are provided in the specification (see Section 6.0.3).
- Timing Constraints: Match the DCLK frequency (51.2 MHz Typ) and horizontal/vertical timing specifications (tH, tV, tHB, tVB) in the host controller. Ensure timing margins for data setup and hold times (Tdsu, Thd = 5 ns min).
- Reset (RSTB): Pin 44 (RSTB) is an active-low global reset pin. Connect with an RC reset circuit (R=10KΩ, C=1μF) for stability and normally pull high. RSTB pulse width must be ≥ 50μs.
- Interface Modes: Pin 8 (MODE) selects between DE mode (pull high) and SYNC mode (pull low). Ensure the host controller matches the selected mode.
- Display Orientation: Pins SHLR (Pin 39) and UPDN (Pin 40) allow for flexible display orientation control.
- Dithering (DITH): Pin 47 (DITH) controls the color resolution. Default is "L" for 6-bit resolution (262K colors). Set to "H" for 8-bit resolution (16.7M colors, last 2 bits truncated).
- Temperature Limits: Operation outside the specified environment range (temperature and humidity) will cause visual quality concerns.
Handling & Compliance
- The module is ROHS Compliant.
- Observe standard ESD precautions during handling and assembly. The module passes ESD tests at ±4KV contact and ±8KV air with 150pF/330Ω.
- The module contains fragile glass and FPC – handle with care.
- Avoid bending the FPC sharply, especially near the connector interface.
- Do not attempt to disassemble or process the LCD Module.
- All NC terminals should be open. Do not connect them to ground or power.
- If the logic circuit power is off, do not apply the input signals.
- The module has a minimum MTBF of 50000 hours at 25°C.
5. Conclusion & Design-In Support
The LS070T21-R-V1 specification details a standard 7.0-inch WSVGA display module with IPS technology, a 50-pin parallel RGB 24-bit interface, 320 cd/m² luminance, 200:1 contrast ratio, and 50000-hour MTBF — an excellent choice for applications requiring a reliable and standard 7.0-inch display with wide viewing angles.
Key Strengths
- WSVGA Resolution (1024×600): Provides standard image quality for a 7.0-inch display.
- IPS Technology: Excellent wide viewing angles and color consistency.
- Standard 50-pin Interface: Parallel RGB 24-bit interface with DE/SYNC mode selection.
- Detailed Timing Specifications: Comprehensive clock and data timing with setup/hold times for reliable integration.
- Clear Power Sequence: Explicit power on/off sequence with detailed timing constraints for reliable operation.
- High Reliability: 50000-hour MTBF and rigorous testing including drop and ESD tests.
- ROHS Compliant: Environmentally friendly design.
Main Design Focus
- The critical design task is properly generating the power supply sequence (DVDD → AVDD/VGL → VGH → Video → Backlight) and matching the DCLK frequency (51.2 MHz Typ) and horizontal/vertical timing in the host controller.
- Supporting requirements: Provide stable VDD (3.3V), AVDD (9.8V), VGH (17V), VGL (-6.8V), and VCOM (3.6V). Design a constant-current backlight driver (IF=180mA, VF=9.2V). Follow the reset timing (≥50μs pulse width) and ESD precautions. Set the MODE pin correctly for the selected interface mode.
This module is an excellent choice for industrial control panels, HMIs, and any embedded system requiring a standard 7.0-inch parallel RGB display with IPS technology and high reliability.
