LS0165I02-QS-V1: 1.65-Inch IPS TFT LCD Module with Capacitive Touch Panel (CTP), 360x360 Resolution, 262K Colors, QSPI Interface

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Product Subtitle / Keywords:
1.65 Inch Display, Square 360x360 Resolution, Transmissive a-Si IPS TFT, QSPI Interface, COG+FPC+B/L, 262K Colors, ST77916 Driver, 20-pin FPC, -20°C~70°C Operating Temperature

1. Executive Summary & Product Positioning

The LS0165I02-QS-V1, developed by LESSON (Wan'an) Zhixian Technology Co., Ltd. (立信(万安)智显科技有限公司), is a 1.65-inch transmissive amorphous Silicon TFT-LCD module featuring IPS (In-Plane Switching) technology for wide viewing angles.

 

 

This product specification book (Revision 1.0, Module Type: COG+FPC+B/L) serves as the definitive technical document, defining its structural composition, precise mechanical dimensions, absolute maximum ratings, detailed electrical characteristics, complete QSPI (Quad Serial Peripheral Interface) pinout and timing, and comprehensive electro-optical performance. It delivers a square resolution of 360(RGB)×360 with 262K-color display capability, driven by the ST77916 controller, and includes an integrated Capacitive Touch Panel (CTP) interface.

The document provides the core parameters necessary for system integration into compact 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 optimal display quality.

2. Detailed Product Overview & Architecture

  • Core Technology: Transmissive-type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display).
  • Display Mode: Transmissive, IPS – providing excellent viewing angles from all directions.
  • 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.
  • Interface: QSPI (Quad Serial Peripheral Interface) – a high-speed 4-line serial interface.
  • Viewing Direction: IPS (Free) – wide viewing angle in all directions.
  • Drive IC: ST77916.
  • Backlight: 3 Chip-White LEDs in Parallel.
  • Touch Panel: Integrated Capacitive Touch Panel (CTP) interface with I²C communication.
  • Approval Status: Approved Product Specification only (as per signature block).

3. Exhaustive Technical Specifications

3.1 Mechanical & Physical Specifications

Item Specification Unit
Module size (H×V×D) 44.3 × 45.64 × 1.56 mm
Active area (H×V) 41.9 × 41.9 mm
Number of dots / Resolution 360(RGB) × 360 pixel
Panel Size (Diagonal) 1.65 inch

Critical Mechanical Design Notes (from document):

  1. Display Type: TFT, transmissive, IPS.
  2. Operating Temperature: -20°C ~ +70°C.
  3. Storage Temperature: -30°C ~ +80°C.
  4. Driver IC: ST77916.
  5. Backlight: 3 Chip-White LEDs, Parallel.
  6. General Tolerance: ±0.2 mm.
  7. Bezel Opening Design: It is recommended that the housing's visible area be at least 0.3mm smaller per side than the module's active area (VAMds).
  8. Foam Gasket Cutout Design: The cutout in the chassis foam gasket should be at least 0.6mm larger per side than the module's viewing area (VAMds).
  9. TP/Conductor Isolation: The Touch Panel (TP) edges must not come into contact with any metal conductors.
  10. Glass Segment to Edge Tolerance: ±0.2 mm.
  11. LCM Thickness: 1.56±0.2 mm (total module thickness).
  12. FPC+PI Reinforcement: Total thickness 0.30 mm.

3.2 Electrical & Interface Specifications

3.2.1 Absolute Maximum Ratings

Item Symbol Min Max Unit Remark
Supply voltage VCC -0.3 4.6 V Note1, Note2
I/O Supply voltage IOVCC -0.3 4.6 V Note1, Note2
Operating temperature TOPR -20 70 °C Note1, Note2
Storage temperature TSTR -30 70 °C Note1, Note2

Critical Note: The storage temperature maximum is 70°C, which is lower than many other modules rated at 80°C. This module should NOT be stored above 70°C.

Notes (interpreted):

  • Note1/Note2: Stress beyond these ratings may cause permanent damage; functional operation is not implied under these conditions.

3.2.2 Electrical Characteristics (DC – Recommended Operating Conditions)

Item Item Symbol Min Typ Max Unit Remark
Supply voltage Supply voltage VCC 2.65 2.8 3.3 V Note1
I/O Supply voltage I/O Supply voltage IOVCC 1.65 1.8 3.3 V Note1
Input Voltage (Low level) Input Voltage (Low level) VIL 0 — 0.3*IOVCC V Note1
Input Voltage (High level) Input Voltage (High level) VIH 0.7*VCC — IOVCC V Note1

Critical Note: The VIH (high-level input voltage) is specified as 0.7 × VCC, not 0.7 × IOVCC. This means the logic high threshold depends on the main supply voltage VCC, which is typically 2.8V. Ensure your host's I/O voltage levels meet this requirement.

3.2.3 Pin Description (20-pin FPC)

PIN NO. Symbol I/O Description
1 CTP_VCC 3.3V P Power Supply for CTP
2 CTP_RST 3.3V I CTP reset
3 CTP_SCL 3.3V I CTP IIC clock
4 CTP_SDA 3.3V I/O CTP IIC data
5 CTP_INT 3.3V O CTP interrupt
6 GND P Power Ground
7 GND P Power Ground
8 TE O Tearing effect signal is used to synchronize MCU to frame memory writing
9 RESET I LCD reset pin. Active low.
10 QSPI_IO3 I/O QSPI data line 3
11 QSPI_IO2 I/O QSPI data line 2
12 QSPI_IO1 I/O QSPI data line 1
13 QSPI_IO0 I/O QSPI data line 0 (data in/out)
14 SCL I LCD serial clock input pin
15 CS I LCD chip select input pin. Enabled when CS is "L".
16 VCC P Power Supply for Analog, Digital System and Booster Circuit
17 GND P Power Ground
18 GND P Power Ground
19 LEDA P LED Anode (Backlight power +)
20 LEDK P LED Cathode (Backlight power -)

Interface Summary:

  • QSPI Interface: Pins 10-13 form a Quad SPI (QSPI) bus — a high-speed 4-bit serial interface allowing data transfer 4x faster than standard SPI.
  • CTP Interface: Pins 1-5 are dedicated to the Capacitive Touch Panel with I²C communication (SCL, SDA), reset (RST), and interrupt (INT) signals. The CTP operates at 3.3V.
  • TE Pin (Pin 8): The Tearing Effect output signal can be used to synchronize MCU writes with the display's internal frame refresh, preventing screen tearing.
  • Backlight: Uses a dedicated anode (LEDA) and cathode (LEDK) pin for the LED backlight.

3.2.4 QSPI Interface Timing Characteristics

Conditions: VDDI=1.65 to 3.3V, VDD=2.65 to 3.3V, GND=RGND=0V, Ta=25°C.

Signal Symbol Parameter Min Max Unit Description
CSX T_CSS Chip select setup time (write) 15 — ns  
CSX T_CSH Chip select hold time (write) 15 — ns  
CSX T_CSS Chip select setup time (read) 60 — ns  
CSX T_SCC Chip select hold time (read) 65 — ns  
CSX T_CHW Chip select "H" pulse width 40 — ns  
SCL T_SCYCW Serial clock cycle (Write) 16 — ns For write command & data RAM
SCL T_SHW SCL "H" pulse width (Write) 7 — ns  
SCL T_SLW SCL "L" pulse width (Write) 7 — ns  
SCL T_SCYCR Serial clock cycle (Read) 150 — ns For read command & data RAM
SCL T_SHR SCL "H" pulse width (Read) 60 — ns  
SCL T_SLR SCL "L" pulse width (Read) 60 — ns  
SDA(DIN) T_SDS Data setup time 7 — ns  
SDA(DIN) T_SDH Data hold time 7 — ns  
DOUT T_ACC Access time 10 50 ns For maximum CL=30pF For minimum CL=8pF
DOUT T_OH Output disable time 15 50 ns For maximum CL=30pF For minimum CL=8pF

Key Timing Observation:

  • Write cycle: Extremely fast 16ns (62.5 MHz clock rate) — data is written on all 4 IO lines simultaneously, achieving an effective throughput of 250 MB/s.
  • Read cycle: Slower 150ns (6.67 MHz clock rate) — significantly slower than writes, which is typical for display controllers.
  • Note: The rising time and falling time (Tr, Tf) of input signals are specified at 15 ns or less. Logic high and low levels are specified as 30% and 70% of VDDI for Input signals.

3.2.5 Backlight Unit

Item Specification Unit
Configuration 3 Chip-White LEDs in Parallel —
Drive Condition IF = 20mA × 3 = 60mA (Typ.) —
Forward Voltage VF = 3.0V (Typ.) V

Note: The backlight consists of 3 parallel white LED chips, each driven at 20 mA, for a total drive current of 60 mA at approximately 3.0V forward voltage. A constant-current LED driver is required.

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

Item Item Symbol Condition Min. Typ. Max. Unit Remark
Response time Response time Tr+Tf θ=0°, Φ=0°, Ta=25°C — 25 35 ms /
Contrast Ratio Contrast Ratio CR θ=0°, Φ=0°, Ta=25°C 1000 1500 — — /
Luminance (White) Luminance (White) LV θ=0°, Φ=0°, Ta=25°C 200 250 — nit /
Luminance uniformity Luminance uniformity δWHITE — 70 80 — % /
Viewing angle range θ3   CR>10 80 85 — deg /
Viewing angle range θ9   CR>10 80 85 — deg /
Viewing angle range θ6   CR>10 80 85 — deg /
Viewing angle range θ12   CR>10 80 85 — deg /
CIE(x,y) chromaticity White Wx θ=0°, Φ=0°, Ta=25°C Typ-0.03 0.318 Typ+0.03 — /
CIE(x,y) chromaticity White Wy θ=0°, Φ=0°, Ta=25°C Typ-0.03 — Typ+0.03 — /

Notes (from document):

  1. Response Time: Defined as the LCD optical switching time between "White" and "Black" states. Rise time (Tr) is 10% to 90% change; Fall time (Tf) is 90% to 10% change. Measured at the center point of the panel at 25°C.
  2. Contrast Ratio (CR): Calculated as CR = Luminance with all pixels white / Luminance with all pixels black. The typical value is an excellent 1500:1.
  3. Luminance (LV): Measured at the center point of the panel. The typical luminance is 250 nit (cd/m²), with a minimum of 200 nit.
  4. Viewing Angle: Due to IPS technology, the viewing angle is a symmetrical 85° typical in all directions (Top, Bottom, Left, Right) measured where Contrast Ratio exceeds 10.
  5. Luminance Uniformity: Measured across 9 points. The minimum uniformity is 70%, typical is 80%.

3.4 Version Record

(Note: The document's Records of Version section is present in the table of contents but the specific revision details are not provided in the given context excerpt.)

4. Application Guidelines & Critical Notes

Intended Use

  • Wearable devices (smartwatches, fitness trackers)
  • Compact IoT interfaces and smart home controls
  • Portable medical devices (e.g., pulse oximeters, glucose monitors)
  • Handheld instruments and measurement devices
  • Hobbyist and maker projects requiring a high-resolution square display
  • Any application demanding a compact, high-resolution display with wide viewing angles

Critical Design Considerations

  1. Storage Temperature – CRITICAL:

    • The maximum storage temperature is 70°C, NOT the typical 80°C seen on other modules.
    • DO NOT store this module in environments exceeding 70°C (e.g., inside a car on a hot day).
    • Operating temperature is standard at -20°C to +70°C.

  2. VIH Voltage Level – CRITICAL:

    • The VIH (input high voltage) threshold is specified as 0.7 × VCC (not 0.7 × IOVCC).
    • With VCC typical at 2.8V, the VIH minimum is 1.96V.
    • If your host MCU operates at 1.8V I/O, the IOVCC can be set to 1.8V, but the VIH requirement references VCC (2.8V). This means your host's output high voltage must be driven to at least 0.7 × 2.8V = 1.96V, which is compatible with 1.8V logic (which typically has VOH > 1.6V but may not guarantee 1.96V). Use 3.3V I/O for the host MCU or level-shift the control signals.

  3. QSPI Interface – High-Speed Design:

    • The QSPI interface uses 4 data lines (IO0-IO3) for simultaneous data transfer, providing 4x the throughput of standard SPI.
    • The write clock cycle minimum is 16ns (62.5 MHz).
    • PCB Layout: Keep the 4 QSPI data lines (IO0-IO3) and clock (SCL) as short as possible and equal in length to minimize skew.
    • Use a series resistor (10-22Ω) on each QSPI line near the host MCU to reduce signal reflections.
    • A separate CS (Chip Select) line is used for command/data selection.

  4. CTP (Capacitive Touch Panel) Integration:

    • The module integrates a Capacitive Touch Panel controlled via I²C (SCL, SDA) with a dedicated reset (RST) and interrupt (INT) pin.
    • The CTP operates at 3.3V (CTP_VCC).
    • The host system must implement an I²C master to communicate with the touch controller.
    • The INT pin signals a touch event to the host. Typically, an interrupt service routine (ISR) should respond by reading the touch data via I²C.
    • Touch calibration will be required in software.

  5. TE (Tearing Effect) Pin:

    • Pin 8 (TE) outputs the display's tearing effect signal.
    • This signal can be used to synchronize MCU frame writes with the display's internal refresh cycle, preventing screen tearing (displaying part of an old frame and part of a new frame simultaneously).
    • If not used, leave this pin open.

  6. Power Supply:

    • Provide stable VCC (2.65-3.3V, 2.8V typical) for the main logic, analog, and booster circuits (connected to Pin 16).
    • Provide stable IOVCC (1.65-3.3V, 1.8V typical) for the I/O interface (used for QSPI signals).
    • Provide 3.3V for the CTP power (Pin 1, CTP_VCC).
    • The backlight requires a constant-current LED driver connected to LEDA (Anode, Pin 19) and LEDK (Cathode, Pin 20), set to 60 mA at approximately 3.0V.

  7. Reset Circuit:

    • The RESET pin (Pin 9) is active low.
    • It must be driven low for a sufficient period (typically >10 µs) during power-up for proper initialization.
    • A simple RC circuit (10kΩ resistor to VCC, 1µF capacitor to GND) or an MCU GPIO is recommended.

  8. Mechanical Integration:

    • Module Outline: 44.3mm (H) × 45.64mm (V) × 1.56mm (D).
    • Active Area: 41.9mm × 41.9mm — a perfectly square display area.
    • Bezel Opening: Design the housing window 0.3mm smaller per side than the active area (41.9mm) to hide the non-active edges. The bezel opening should be 41.3mm × 41.3mm.
    • Foam Gasket Cutout: Design the cutout 0.6mm larger per side than the viewing area to avoid applying pressure on the display surface.
    • The module uses a 20-pin FPC with 0.5mm pitch (from the drawing notation). Ensure the connector is properly selected.

  9. Backlight Protrusion:

    • The document notes: "背光灯线处高及(出请注意机壳避空)" — the backlight wiring area protrudes. The mechanical housing must provide clearance (hollow out / avoid) this area to prevent short circuits or physical damage.

  10. Temperature Limits:

    • Operating Temperature: -20°C to +70°C.
    • Storage Temperature: -30°C to +70°C (Note the 70°C max).

Handling & Compliance

  • The module is ROHS compliant.
  • Observe standard ESD precautions during handling and assembly.
  • The module contains fragile glass and a 20-pin FPC – handle with care.
  • Avoid bending the FPC sharply, especially near the connector interface.
  • The module includes a capacitive touch panel — avoid scratching the touch surface.

5. Conclusion & Design-In Support

The LS0165I02-QS-V1 specification details a compact, high-performance 1.65-inch square IPS display module with an integrated capacitive touch panel and a high-speed QSPI interface.

Key Strengths:

  1. High-Resolution Square Display: The 360x360 resolution in a 1.65-inch square format is ideal for round or circular watch faces (with a circular mask) or symmetrical UI designs.

  2. IPS Technology: 85-degree viewing angles in all directions ensure consistent image quality from any perspective — essential for wearable devices.

  3. High-Speed QSPI Interface: The 16ns write cycle with 4-bit parallel data transfer provides excellent throughput for smooth animations and fast screen updates.

  4. Integrated Capacitive Touch Panel: The module includes a complete touch solution with I²C interface, reset, and interrupt control, simplifying system integration.

  5. Excellent Optical Performance:

    • Contrast Ratio: 1500:1 (Typ.) — excellent deep blacks and bright whites.
    • Response Time: 25ms (Typ.) — suitable for most GUI applications.
    • Luminance: 250 nit (Typ.) — adequate for indoor use.

  6. Comprehensive Interface: The 20-pin FPC provides separate pins for display control (QSPI), CTP (I²C + INT + RST), backlight, and power.

  7. TE (Tearing Effect) Support: The dedicated TE pin enables tear-free graphics synchronization.

Main Design Focus:

  • The most critical design tasks are:

    1. Respecting the 70°C storage temperature limit — do not store in hot environments.
    2. Ensuring VIH compatibility — use 3.3V I/O for the host MCU or level-shift the control signals to meet the 0.7 × VCC threshold.
    3. High-speed QSPI PCB layout — length-match the 4 data lines and clock for reliable operation at 62.5 MHz.
    4. CTP driver development — implement I²C communication with the touch controller and handle interrupts.

  • Supporting requirements:

    • Provide stable VCC (2.8V) and IOVCC (1.8V) power.
    • Provide a constant-current backlight driver set to 60 mA at 3.0V.
    • Mechanical integration — follow the bezel opening and foam cutout guidelines.
    • FPC connector — use a 0.5mm pitch, 20-pin FPC connector.

Comparison with Similar Model (LS0165I01-QS-V1):

Feature LS0165I01-QS-V1 LS0165I02-QS-V1
Resolution 360(RGB)×360 360(RGB)×360
Display Type Transmissive, IPS Transmissive, IPS
Colors 262K 262K
Driver IC ST77916 ST77916
Backlight 3 Chip-White LED Parallel 3 Chip-White LED Parallel
CTP Interface Not present (no CTP pins) Integrated (I²C CTP interface on pins 1-5)
Backlight Drive VF=3.0V(TYP); If=20*3mA VF=3.0V(TYP); If=20*3mA
Storage Temp -30°C~80°C -30°C~70°C
FPC Pins 20 20 (with CTP assignments)
LCM Thickness 1.60±0.2mm 1.56±0.2mm

Key Difference: The LS0165I02-QS-V1 adds a Capacitive Touch Panel interface (I²C) to the same base display, while the LS0165I01-QS-V1 does not have a touch interface. The LS0165I02 also has a slightly thinner module (1.56mm vs 1.60mm) and a lower maximum storage temperature (70°C vs 80°C).

This module is an excellent choice for wearable devices, smart home controls, and any compact IoT application requiring a high-resolution square display with touch input capability and a modern high-speed serial interface.