LESSON LS2145I01-L-V1 21.45-Inch TFT-LCD Open Cell: Complete Technical Specification

Document Revision: Ver. 2.1
Publication Date: December 19, 2023 (Release Date: 19.Dec.2023)
Upload Date: December 23, 2025
Keywords: LS2145I01-L-V1, 21.45 inch LCD, FHD, 1920x1080, Ultra High Contrast 4000:1, Wide Viewing Angle 178°, LVDS, CID, Open Cell, Transmissive, Normally Black

1. GENERAL DESCRIPTION

1.1 Product Features

• FHD Resolution (1920 × 1080)
• Very High Contrast Ratio: 4000:1
• High Color Saturation: 72% NTSC
• Fast Response Time
• Ultra Wide Viewing Angle: 178°(H)/178°(V) (CR≥10)
• DE (Data Enable) Mode
• LVDS (Low Voltage Differential Signaling) Interface

1.2 Overview

LS2145I01-L-V1 is a diagonal 21.45" color active matrix LCD open cell with 2 Channel interface. This open cell is a transmissive type display operating in the normally black mode. It supports 1920 × 1080 FHD resolution and can display up to 16.7M colors (8 bit). Each pixel is divided into Red, Green and Blue sub-pixels which are arranged in vertical stripe.

This open cell dedicates for CID (Car Information Display) products and provides excellent performance which includes high contrast ratio, high color saturation and high color depth. CSOT open cell comply with RoHS for identification.

1.3 General Information

2. ENVIRONMENT REQUIREMENT

2.1 Temperature & Humidity Range

(1) Temperature and relative humidity range are shown as below.

(a) 90%RH maximum (TA < 39 °C).
(b) Wet-bulb temperature should be 39 °C maximum (TA > 39 °C).
(c) No condensation.

(2) The open cell should be keep at a circumstance shown below:

Note: The Ripple Voltage should be controlled less than 10% of VCC and measured under the condition of VCC(typ), TA=25±2°C, Measurement condition: VCC rising time = 470 µs.

PANEL VCOVCCOFUSERQ3Main boardCSOT Panel InputCRPanel_ENQC3R5Vcc0.9Vc0.1VccGND470us

Note:
(1) Condition: Vcm=1.2V
(2) The product should be always operated within above ranges.
(3) The LVDS input signal has been defined as follows:

Differential Signal

Fig. 3.3 LVDS input signal

3. INTERFACE SPECIFICATIONS

3.1 Temperature Specifications

Not detailed in provided content

3.2 Connector Direction

(1) The direction of pin assignment is shown as below:

#1#30aaCN1CN1F#1#30

Fig. 4.1 Connector direction sketch map

3.3 Block Diagram of Interface

TIMINGCONNECTORCONTROLLERLV1N0100LV1P0LV1N100QLV1PLV1N2□100QLV1P2VCK1N100QLVCK1PLV1N31002LV1P3

Fig. 4.2 Block diagram of interface

Attention:
(1) This open cell uses a 100 ohms (Ω) resistor between positive and negative lines of each receiver input.
(2) LVDS cable impedance shall be 50 ohms per signal line or about 100 ohms per twist-pair line respectively.

Note:
(1) The TFT LCD open cell is operated in DE only mode, H sync and V sync input signal have no effect on normal operation.
(2) $Fclkin = TH \times TV \times Frate \times (1+Fclkin mod)$, TH, TV and Frate should operate within the range between Pixel clock frequency Min. and Pixel clock frequency Max..

4. INTERFACE TIMING

4.1 Interface Signal Timing Diagram

ALAL"^IDEDCLKUUUTCLKTHBTHDDEDATAValid Display Data(960 clocks)

Fig. 5.1 Interface signal timing diagram

(3) The input clock cycle-to-cycle is defined as below figures.

TT2=T1±TrcT1=T±Trcl

Fig. 5.2 Jitter

(4) The SSM (Spread Spectrum Modulation) is defined as the following figure. The LVDS SSM's suggestion is disabled by default; SOC board should test all validation if SOC board enables the LVDS SSM.

1/FSSMFelkin_mod(maxFclkinFclkin_mod(min

Fig. 5.3 SSM

(5) The LVDS timing diagram and setup/hold time is defined in the following figure.

TcN/PLVCK1N/PIN/PnLV1N/PnTRSM

Fig. 5.4 LVDS receiver interface timing diagram

Attention:
(1) The supplied voltage of the external system for the open cell input should follow the definition of VCC.
(2) When the backlight turns on before the LCD operation or the LCD turns off before the backlight turns off, the display may momentarily become abnormal screen.
(3) In case that VCC is in off level, keep the level of input signals on the low or high impedance. If T2 < 0, that may cause electrical overstress.
(4) T4 should be measured after the module has been fully discharged between power off and on period.
(5) Interface signal shall not be kept at high impedance when the power is on.

5. OPTICAL CHARACTERISTICS

5.1 Measurement Conditions

The table below is the test condition of optical measurement.

Measurement Equipment: CA310, ELDIM OPTI Scope-SA and ELDIM EZ contrast in dark room.

5.2 Optical Specifications

5.3 Optical Measurement Notes

Note (1) Definition of static contrast ratio (CR):
It's necessary to switch off all the dynamic and dimming function when measuring the static contrast ratio.

$$\text{Static Contrast Ratio (CR)} = \frac{\text{CR-W}}{\text{CR-D}}$$

CR-W is the luminance measured by LMD (light-measuring device) at the center point of the LCD module with full-screen displaying white. The standard setup of measurement is illustrated in Fig. 6.3; CR-D is the luminance measured by LMD at the center point of the LCD module with full-screen displaying black. The LMD in this item is CS2000.

Note (2):
The LMD in the item could be a spectroradiometer such as (KONICA MINOLTA) CS2000, CS1000(TOPCON), SR-UL2 or the same level spectroradiometer. Other display color analyzer (KONICA MINOLTA) CA210, CA310 or (TOPCON) BM-7 could be involved after being calibrated with a spectroradiometer on each stage of a product.

Black & White大LMD

Note (3) Response time TL:
Response time TL is defined as the average transition time in the response time matrix. The table below is the response time matrix in which each element tX to Y is the transition time from luminance ratio X to Y. X and Y are two different gray level among 0%, 25%, 50%, 75%, and 100% gray level. The transition time tX to Y is defined as the time taken from 10% to 90% of the luminance difference between X and Y (X < Y) as illustrated in Fig. 6.4. When X > Y, the definition of tX to Y is the time taken from 90% to 10% of the luminance difference between X and Y. The response time is optimized on refresh rate Fr = 60Hz.

Note (4):
Each chromaticity coordinates (x, y) are measured in CIE1931 color space when full-screen displaying primary color R, G, B and white. The color gamut is defined as the fraction in percent of the area of the triangle bounded by R, G, B coordinates and the area is defined by NTSC 1953 color standard in the CIE color space. Chromaticity coordinates are measured by CS2000 and the standard setup of measurement is shown in Fig. 6.5.

Colors大LMD

Note (6) Definition of viewing angle coordinate system (θH, θV):
The contrast ratio is measured at the center point of the LCD module. The viewing angles are defined at the angle that the contrast ratio is larger than 10 at four directions relative to the perpendicular direction of the LCD module (two vertical angles: up θV+ and down θV-; and two horizontal angles: right θH+ and left θH-) as illustrated in Fig. 6.6. The contrast ratio is measured by ELDIM EZ Contrast.

6. MECHANICAL CHARACTERISTICS

6.1 Mechanical Specification

Not detailed in provided content

6.2 Packing

6.2.1 Packing Specifications

6.2.2 Packing Method

PanelEPE SpacerPanel(20pcs/BoxEPE Spacer(21pcs/Box)OC Box_BottomEPE Spacer_Reg(1pcsOC Box_Top(4pcs)8 Layers.32 BoxesDesiccant(4pcs1Box Label(2pcsCorer Protector(8pcs)PP BelPE SheePE Film(2layers)PE SheetPP BelPallet (Wood:1250*1000*144mm)Pallet Label(2pcs

Fig. 7.1 Packing method

7. PRECAUTIONS

7.1 Assembly and Handling Precautions

(1) The device listed in the product specification sheets was designed and manufactured for CID application only.
(2) Do not apply rough force such as bending or twisting to the open cell during assembly.
(3) It is recommended to assemble or install an open cell into the user's system in clean working areas. The dust and oil may cause electrical short or damage the polarizer.
(11) Any attachment on polarizer of open-cell such as tape is forbidden and not recommended, especially under the high temperature and high humidity environment.

7.2 Safety Precautions

(1) If the liquid crystal material leaks from the panel, it should be kept away from the eyes or mouth. In case of contact with hands, skin or clothes, it should be washed away thoroughly with soap.
(2) After the open cell end of life, it is not harmful in case of norm.

8. TECHNICAL SUMMARY & KEY DIFFERENTIATORS

8.1 Unique Selling Points

1. Ultra High Contrast Ratio: 4000:1 - Exceptional black levels and image depth
2. Ultra Wide Viewing Angle: 178°(H)/178°(V) - Near-perfect viewing from all angles
3. Optimized for CID Applications - Specifically designed for Car Information Displays
4. High Color Saturation: 72% NTSC - Rich, vibrant colors
5. Fast Response Time: 8-12ms - Good motion performance
6. 8-bit Color Depth - 16.7M colors for smooth gradients

8.2 Critical Specifications Summary

• Size: 21.45 inches (diagonal)
• Resolution: 1920 × 1080 (FHD)
• Active Area: 478.656 × 260.28 mm
• Cell Size: 487.456 × 270.18 × 1.335 mm (without side sealing)
• Weight: 0.418 kg (typical)
• Pixel Pitch: 0.0831(H) × 0.241(V) mm
• Interface: 2 Channel LVDS with DE mode
• Refresh Rate: 60 Hz
• Cell Transmittance: 4.4% (typical)
• Gamma: 2.2 (typical)
• Polarizer: AG25% (Anti-Glare 25%)

8.3 Application-Specific Design

CID (Car Information Display) Optimization:

• High Contrast (4000:1): Essential for readability in varying automotive lighting conditions
• Wide Viewing Angles (178°): Allows visibility from different seating positions
• Fast Response Time: Important for dynamic content and video playback
• Temperature & Humidity Range: Suitable for automotive environments
• DE Mode Interface: Simplifies integration with automotive electronics

8.4 Integration Requirements

1. Backlight Unit: Requires external backlight (CSOT Flat BLU referenced: Wx=0.278, Wy=0.272)
2. Power Supply: VCC = 5V typical
3. Interface: LVDS with 100Ω termination resistors
4. Timing: DE only mode (no HSYNC/VSYNC required)
5. Environmental: Operating within specified temperature/humidity ranges
6. Handling: Clean assembly environment, no tape on polarizer

8.5 Performance Benchmarks

• Contrast Ratio: 4000:1 places this in premium display category
• Viewing Angles: 178°/178° approaches theoretical maximum
• Color Gamut: 72% NTSC provides good color reproduction
• Response Time: 8-12ms suitable for most applications including video
• Transmittance: 4.4% indicates good light efficiency

9. COMPARISON WITH OTHER 21.5-INCH MODELS

10. RECOMMENDED APPLICATIONS

1. Primary: Car Information Displays (CID) - Instrument clusters, infotainment systems
2. Secondary: Industrial Control Panels - Where high contrast is critical
3. Tertiary: Medical Displays - Diagnostic monitors requiring high contrast
4. Additional: Broadcast Monitoring - Professional video monitoring
5. Specialized: Aviation Displays - Cockpit instrumentation

Conclusion: The LS2145I01-L-V1 represents a premium-grade 21.45-inch FHD open cell specifically engineered for automotive CID applications where exceptional contrast (4000:1) and wide viewing angles (178°/178°) are paramount. Its 8-bit color depth, 72% NTSC color gamut, and fast response time make it suitable for demanding display applications beyond automotive, including medical and professional monitoring. As an open cell, it requires integration with appropriate backlight and driver electronics, offering flexibility for system designers while maintaining CSOT's high-quality panel technology.

Critical Integration Note: This is an open cell (not a complete module), requiring:

1. External backlight unit
2. Proper LVDS interface implementation with 100Ω termination
3. Adherence to power sequencing and environmental specifications
4. Careful handling during assembly (clean environment, no tape on polarizer)

Final Recommendation: For automotive CID applications or any application requiring exceptional contrast and wide viewing angles, the LS2145I01-L-V1 offers performance characteristics that exceed standard industrial or monitor displays. Its specialized design for automotive environments makes it particularly suitable for next-generation vehicle displays.

Document Status: This specification is based on Ver. 2.1 dated 19.Dec.2023. Always verify with the latest official document from LESSON Smart Display Technology Co., Ltd. for production implementation.