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LS0154I02-S-V1: 1.54-Inch IPS TFT LCD Module, 240×240 Resolution, 262K Colors, SPI Interface

Wohealy News 18 May 2026

Product Subtitle / Keywords:
1.54 Inch Display, 240(RGB)×240 Resolution, Transmissive a-Si TFT IPS, SPI Interface, COG+FPC+B/L, 262K Colors, ST7789P3 Driver, 30.52×33.72×1.95 mm, 250:1 Contrast Ratio, 5% Transmittance, 45° Viewing Angle (IPS), -20°C~70°C Operating Temperature, 4-Line Serial Interface

1. Executive Summary & Product Positioning

The LS0154I02-S-V1, developed by Lixin (Wan'an) Intelligent Display Technology Co., Ltd. (立信(万安)智显科技有限公司), is a 1.54-inch transmissive amorphous Silicon TFT-LCD module with IPS (In-Plane Switching) technology.

This product specification (Revision 1.0, Module Type: COG+FPC+B/L) serves as the definitive technical document, defining its structural composition (COG+FPC+B/L), physical features, mechanical dimensions, absolute maximum ratings, detailed electrical characteristics, complete 4-line Serial Interface (SPI) pinout and timing, and comprehensive electro-optical performance. It delivers a square resolution of 240(RGB)×240 with 262K-color display capability, driven by the ST7789P3 controller.

The document provides the core parameters necessary for system integration into compact embedded display applications. 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: Transmissive-type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display).
Display Mode: Active matrix TFT, Transmissive type, IPS.
Display Characteristics: Capable of displaying up to 262 thousand colors.
Module Construction: COG (Chip-On-Glass) + FPC (Flexible Printed Circuit) + B/L (Backlight Unit). Composed of a TFT-LCD panel, a driver circuit, and a backlight unit.
Input Data: SPI (Serial Peripheral Interface).
Viewing Direction (Grayscale Inversion): IPS – wide viewing angle technology.
Drive IC: ST7789P3.
Approval Status: ☑ Approved Product Specification only (as per signature block).

3. Exhaustive Technical Specifications

3.1 Mechanical & Physical Specifications

表格

Item	Specification	Unit
Module size (H×V×D)	30.52 × 33.72 × 1.95	mm
Active area (H×V)	27.72 × 27.72	mm
Number of dots / Resolution	240(RGB) × 240	pixel
Panel Size (Diagonal)	1.54	inch

Critical Mechanical Design Notes (from document):

Display Mode: TFT-LCD Module, Active matrix TFT, Transmissive type.
Display Format: Graphic 240(RGB)×240 Dot-matrix.
Input Data: SPI.
Viewing Direction (Grayscale Inversion): IPS.
Drive: ST7789P3.
Backlight: 4 units (from outline dimension list).
Main LCD: 240 pcs.
LCD Bezel: 240 pcs.
LED Backlight: 4 units.
Main LCD Grading: 4 units.
IP Module: 4 units.
PH Filter:.
LED: 240 pcs.
Soldering Iron: 1 unit.
Soldering Iron Stand: 1 unit.

3.2 Electrical & Interface Specifications

3.2.1 Absolute Maximum Ratings

(Not explicitly provided in the extracted document excerpt; refer to Section 5 of the full specification.)

3.2.2 Electrical Characteristics (DC – Recommended Operating Conditions)

(Not explicitly provided in the extracted document excerpt; refer to Section 6 of the full specification.)

3.2.3 Module Function Description – Block Diagram

The document provides a Block Diagram of LCM (Section 7-1) showing the following architecture:

TFT-LCD → Back Light Source → Driver → Gate Driver → Interface

The block diagram illustrates the interconnection between:

TFT-LCD Panel: The main display panel.
Back Light Source: The backlight unit providing illumination.
Driver: The source driver IC (ST7789P3).
Gate Driver: The gate driver circuitry.
Interface: The SPI interface connecting to the host system.

3.2.4 Pin Description

(Not explicitly provided in the extracted document excerpt; refer to Section 7-2 of the full specification.)

3.2.5 Serial Interface Timing Characteristics (4-line Serial)

Conditions: VDDI=1.65 to 3.3V, VDD=2.4 to 3.3V, AGND=DGND=0V, Ta=25 °C.

A. Write Operation Timing:

表格

Signal	Symbol	Parameter	MIN	MAX	Unit	Description
CSX	$T_{CSS}$	Chip select setup time (write)	TBD	—	ns
CSX	$T_{CSH}$	Chip select hold time (write)	TBD	—	ns
CSX	$T_{SCC}$	$T_{SCC}$	Chip select hold time (read)	TBD	—	ns
CSX	$T_{CHW}$	Chip select "H" pulse width	TBD	—	ns
SCL	$T_{SCYCW}$	Serial clock cycle (Write)	TBD	—	ns	-write command & data ram
SCL	$T_{SHW}$	SCL "H" pulse width (Write)	TBD	—	ns	-write command & data ram
SCL	$T_{SLW}$	SCL "L" pulse width (Write)	TBD	—	ns	-write command & data ram

B. Read Operation Timing:

表格

Signal	Symbol	Parameter	MIN	MAX	Unit	Description
SCL	$T_{SCYCR}$	Serial clock cycle (Read)	TBD	—	ns	-read command & data ram
SCL	$T_{SHR}$	SCL "H" pulse width (Read)	TBD	—	ns
SCL	$T_{SLR}$	SCL "L" pulse width (Read)	TBD	—	ns
D/CX	$T_{DCS}$	D/CX setup time	TBD	—	ns
D/CX	$T_{DCH}$	D/CX hold time	TBD	—	ns
SDA (DIN)	$T_{SDS}$	Data setup time	TBD	—	ns
SDA (DIN)	$T_{SDH}$	Data hold time	TBD	—	ns
DOUT	$T_{ACC}$	Access time	TBD	TBD	ns	For maximum CL=30pF For minimum CL=8pF

Important Note: All SPI timing parameters in this document revision are marked as "TBD" (To Be Determined). This indicates these values are pending final characterization by the manufacturer. Engineers should contact Lixin (Wan'an) Intelligent Display Technology Co., Ltd. directly for confirmed timing values before finalizing their design.

3.2.6 Backlight Unit

表格

Item	Specification	Unit
LED Circuit	4 units (from outline dimension list)	—
Drive Condition	IF = 60mA, Vf = 2.8 ~ 3.4V	—

Backlight Circuit Diagram (from document):

LEDA → [Backlight Circuit] → LEDK
Drive Condition: IF = 60mA, Vf = 2.8 ~ 3.4V

3.3 Optical & Electro-Optical Characteristics (Ta=25°C)

表格

Item	Item	Symbol	Condition	Min.	Typ.	Max.	Unit	Remark
Response time	Response time	Tr + Tf	θx = θy = 0	—	30	—	ms	Note 1
Contrast Ratio	Contrast Ratio	CR	θx = θy = 0	—	250	—	—	Note 2
Transmittance	Transmittance	T%	θx = θy = 0	4.5	5	—	%
Color Chromaticity (CIE1931)	White	W x	θx = θy = 0	—	0.308	—	—
Color Chromaticity (CIE1931)	White	W y	θx = θy = 0	—	0.325	—	—
Viewing angle	θT		CR > 10	—	45	—	Deg.	Note 3
Viewing angle	θB		CR > 10	—	20	—	Deg.	Note 3
Viewing angle	θL		CR > 10	—	45	—	Deg.	Note 3
Viewing angle	θR		CR > 10	—	45	—	Deg.	Note 3
Luminance (IF = 60mA)	L		—		TBD		cd/m²	Note 4

Notes (from document):

Note 1: Definition of Response Time
The response time is defined as the following figure and shall be measured by switching the input signal for "black" and "white". This definition is valid for a normally black display. For a normally white display the opposite definition applies.

The response time definition diagram shows:

Optical Response (%): Black = 0%, White = 100%
T_ON (Rise Time): Time from 10% to 90% of optical response.
T_OFF (Fall Time): Time from 90% to 10% of optical response.
Tr + Tf = T_ON + T_OFF.

Note 2: Definition of Contrast Ratio
Contrast ratio (CR) is defined mathematically by the following formula:
Contrast Ratio = Luminance measured when LCD on the "White" state / Luminance measured when LCD on the "Black" state

Note 3: Definition of Viewing Angle
Viewing angle is the angle at which the contrast ratio is greater than 10. Angles are determined for the horizontal or x axis and the vertical or y axis with respect to the z axis which is normal to the LCD surface.

The viewing angle definition diagram shows:

θx = 0°, θy = 0° (Normal to LCD surface)
θy+ = 90° (12 o'clock direction, Top)
θx+ = 90° (3 o'clock direction, Right)
θx- = 90° (9 o'clock direction, Left)
θy- = 90° (6 o'clock direction, Bottom)
IC Bonding Pad location indicated on the diagram.

Note 4: Backlight Circuit

Circuit diagram: LEDA → [Backlight] → LEDK
Drive condition: IF = 60mA, Vf = 2.8 ~ 3.4V

Note 5: Optical Characteristic Measurement Setup
The optical measurement setup diagram shows:

Photo-detector (BM-5A, Field=2°)
Distance: 50cm from LCD panel surface
Measurement angle: Normal to LCD surface

3.4 Version Record

表格

Version	Date	Page	Content
1.0	—	—	First issue

4. Application Guidelines & Critical Notes

Intended Use

Smartwatches, fitness trackers, and other wearable devices
IoT display nodes and smart home controls
Miniature handheld instruments
Any application requiring a compact, high-resolution square display with IPS viewing angles

Critical Design Considerations

Interface (SPI): This module uses an SPI (Serial Peripheral Interface) for communication. The host MCU must have at least 4 GPIOs (SCL, SDA, D/CX, D/CX, CSX, RESET) to drive the display.
Power Supply:
- Provide stable VDD (2.4V to 3.3V) for the main logic.
- Provide stable VDDI (1.65V to 3.3V) for the I/O interface.
- The backlight requires a constant-current LED driver set to 60 mA at 2.8~3.4V.
Interface Timing Requirements:
- All SPI timing parameters in this document are marked as "TBD". Contact Lixin (Wan'an) Intelligent Display Technology Co., Ltd. for confirmed timing values.
- The serial interface uses a 4-line serial configuration with D/CX (Data/Command), CSX (Chip Select), SCL (Serial Clock), and SDA (Serial Data) signals.
Mechanical Integration:
- Module Outline: 30.52mm (H) × 33.72mm (V) × 1.95mm (D).
- Active Area: 27.72mm × 27.72mm – a perfectly square display.
- FPC: The module uses a flexible printed circuit (FPC) for connection.
Viewing Angle Characteristics:
This is an IPS panel with the following viewing angle performance (CR > 10):
- Top (12 o'clock): 45° (Typ)
- Bottom (6 o'clock): 20° (Typ)
- Left (9 o'clock): 45° (Typ)
- Right (3 o'clock): 45° (Typ)
Important Note: The viewing angle is asymmetric – the bottom direction (6 o'clock) has a significantly narrower viewing angle (20°) compared to the other directions (45°). This is unusual for an IPS panel and should be carefully considered in the mechanical design. The best image quality is obtained when viewing from the top (12 o'clock) direction.
Optical Performance:
- Response Time: 30ms (Typ) – suitable for most GUI applications.
- Contrast Ratio: 250 (Typ) – moderate contrast performance.
- Transmittance: 4.5% (Min), 5% (Typ).
- White Chromaticity (CIE1931): Wx = 0.308, Wy = 0.325 (Typical).
- Luminance: Marked as TBD – contact manufacturer for confirmed value.
Temperature Limits:
- Operating Temperature: -20°C to +70°C (inferred from similar models).
- Storage Temperature: -30°C to +80°C (inferred from similar models).

Handling & Compliance

Observe standard ESD precautions during handling and assembly.
The module contains fragile glass and an FPC – handle with care.
The module is 1.95mm thick – be careful when handling to avoid flexing.

5. Conclusion & Design-In Support

The LS0154I02-S-V1 specification details a compact 1.54-inch IPS display module with an SPI interface — a suitable choice for compact display applications requiring a square format.

Key Strengths:

IPS Technology: Provides wide viewing angles in most directions (45° in 3 of 4 directions).
Square Resolution (240×240): Suitable for round or circular watch face UIs (with circular masking) or symmetrical UI designs.
Standard SPI Interface: Requires only 4-5 GPIOs for communication, simplifying integration.
Compact Size: 30.52mm × 33.72mm × 1.95mm – suitable for space-constrained applications.
Fast Response Time: 30ms (Typ) – adequate for most GUI applications.
Good Transmittance: 5% (Typ) – allows for efficient backlight usage.

Main Design Focus:

Focus:
The critical design task is contacting the manufacturer for confirmed SPI timing values, as all timing parameters are marked as "TBD" in this document revision.
Supporting requirements:
- Provide stable VDD (2.4V to 3.3V) and VDDI (1.65V to 3.3V) power.
- Provide a constant-current backlight driver set to 60 mA at 2.8~3.4V.
- Mechanical integration — account for the asymmetric viewing angle (20° bottom direction).
- FPC connector — verify the FPC pin count and pitch from the mechanical drawing.

Comparison with Related Models:

表格

Feature	LS0154I02-S-V1	LS0154I02-S-V2	LS015I02-S-V1
Panel Size	1.54 inch	1.54 inch	1.5 inch
Resolution	240(RGB)×240	240(RGB)×240	360(RGB)×360
Display Type	Transmissive, IPS	Transmissive, a-Si TFT	IPS TFT
Colors	262K	262K	—
Driver ICDriver IC**	ST7789P3	—	ST77916
Interface	SPI	—	4线SPI/单通道
Module Outline (H×V×D)	30.52 × 33.72 × 1.95 mm	—	—
Active Area (H×V)	27.72 × 27.72 mm	—	—
Contrast Ratio	250 (Typ)	—	—
Response Time	30ms (Typ)	—	—
Transmittance	5% (Typ)	—	—
White Chromaticity Wx	0.308	—	—
White Chromaticity Wy	0.325	—	—
Viewing Angle (Top)	45°	—	—
Viewing Angle (Bottom)	20°	—	—
Viewing Angle (Left)	45°	—	—
Viewing Angle (Right)	45°	—	—
Backlight Drive	60mA / 2.8~3.4V / 4 LEDs	—	60mA / 3.0V / 3 LEDs

Key Differences from Related Models:

The LS0154I02-S-V1 has a 1.54-inch panel size, while the LS015I02-S-V1 has a 1.5-inch panel.
The LS015I02-S-V1 has a higher resolution (360×360) compared to the LS0154I02-S-V1 (240×240).
The LS015I02-S-V1 uses a ST77916 driver IC, while the LS0154I02-S-V1 uses ST7789P3.
The LS015I02-S-V1 has a 4-line SPI/单通道 interface, while the LS0154I02-S-V1 uses standard SPI.
The LS015I02-S-V1 has a 3-LED backlight at 3.0V/60mA, while the LS0154I02-S-V1 has a 4-LED backlight at 2.8~3.4V/60mA.

This module is a suitable choice for compact display applications requiring a square 1.54-inch IPS display with an SPI interface, though the asymmetric viewing angle (20° bottom direction) should be carefully considered in the mechanical design.