TXW276002B0-CTP Product Specification

Basic Business Information

Han Bing is the dedicated contact for this module. You can reach him via phone at +86 13823639945 or +86 0755-82597676, or send inquiries to the official email address hanbing@txwlcd.com. The company’s official website is accessible at http://www.txwlcd.cn, and the production facility is located on the 4th Floor, Building E, Hengqiang Industrial Park, Jian’an Road, Shajing Street, Bao’an District, Shenzhen, China.

The product’s project number and customer model fields support custom filling as required. All delivered units are manufactured with lead-free processes throughout the entire production flow, fully complying with RoHS environmental control requirements.

1. Product Scope and Core Features

This specification covers the 2.76-inch integrated touch display module, a purpose-built interactive display component developed by Tianxianwei Technology for a wide range of interactive terminals. It features a native 480×RGB×480 resolution, with the display driven by the Sitronix ST7701SN main control IC. Full details of all drive-related parameters can be directly referenced in the official specification document and datasheet released by the chip manufacturer.

From a hardware stacking perspective, the TXW276002B0-CTP consists of five stacked layers: TFT panel, driver IC, flexible FPC circuit board, backlight unit and G+F structure capacitive touch layer. It adopts an IPS wide-view display scheme, capable of outputting 480 segment signals and 480 common terminal signals. 16.7M full-color display can be enabled via software configuration, with a built-in white LED backlight unit and a 2-lane MIPI high-speed transmission interface.

2. General Specification Definition

Core Display Attributes

This product uses a normally black active matrix TFT drive architecture with RGB stripe pixel arrangement. The pixel pitch in both horizontal and vertical directions is 0.1461mm, and the effective display area measures 70.13mm (H) × 70.13mm (V), supporting full omnidirectional (ALL O'CLOCK) color-shift-free viewing.

The pure LCM unit without touch has overall dimensions of 73.03mm (W) × 76.48mm (H) × 2.30mm (T). After stacking the touch layer, the total overall dimensions become 81.23mm (W) × 84.40mm (H) × 3.68mm (T). The overall module weight is pending final calibration and confirmation.

Touch Unit Attributes

The touch section adopts a G+F stacked structure, equipped with the CST830 touch driver IC and an I2C communication interface. The touch layer delivers 85% visible light transmittance and a 6H surface Mohs hardness. All dimensions without marked tolerances are controlled at ±0.20mm by default.

A general design recommendation for complete machine integration is that the touch panel window should reserve a 0.3~0.5mm margin on each single side relative to the LCM effective display area, to avoid touch dead zones at the edges.

3. Absolute Maximum Ratings

To ensure long-term stable operation of the product, strict absolute operating boundaries are defined:

• Operating temperature range for the LCM unit: -20°C ~ +70°C
• Storage temperature range for the LCM unit: -30°C ~ +80°C
• Operating temperature and humidity range for the touch unit: -20°C ~ +70°C, 20%~90%RH
• Storage temperature and humidity range for the touch unit: -30°C ~ +80°C, 20%~90%RH
• Maximum allowable relative humidity upper limit for the complete unit: 90%
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4. Electrical Characteristic Specifications

TFT DC Electrical Parameters

The I/O domain power supply (IOVCC) allows an operating range of 1.65V~3.3V, with a typical supply value of 1.8V. The power supply (VCI) for the built-in DC-DC conversion circuit of the driver operates in the range of 2.5V~3.3V, with a typical supply value of 2.8V.

Backlight Unit Characteristics

This module uses an edge-lit backlight scheme with 4 built-in white LED chips. The LED forward voltage ranges from 5.4V to 6.6V, with a typical forward operating current of 80mA. After stacking the LCD and CTP layers, the overall brightness is minimum 450cd/㎡ with a typical value of 500cd/㎡, and the minimum brightness uniformity requirement is 80%.

The nominal service life of the LED is defined as 20,000 hours. This lifetime benchmark is determined under the operating condition of 20mA current per single LED, when the overall module brightness attenuates to 50% of its initial value. If the operating current of a single LED exceeds 25mA, the actual backlight lifetime will decrease to varying degrees.

5. 30-Pin FPC Pin Function Description

The function of each pin on the 30-pin flexible circuit board matched with the module is defined as follows:

1. Pin 1 (Symbol LEDA): Backlight anode power supply input pin
2. Pin 2, 3 (Symbol LEDK): Backlight cathode power supply input pin
3. Pin 4 (Symbol VCI): Display core power supply pin, typical supply 2.8V
4. Pin 5 (Symbol IOVCC): I/O domain power supply pin, typical supply 1.8V
5. Pin 6 (Symbol RESET): Driver reset signal input pin, active at low level, typical level 1.8V
6. Pin 7 (Symbol TE): Tearing effect frame sync head pulse output pin
7. Pin 8 (Symbol PWM): Backlight drive PWM dimming signal input pin
8. Pin 9, 12, 15, 18, 21, 24, 30 (Symbol GND): Power ground pin
9. Pin 10 (Symbol D0P): Positive pin of MIPI low-voltage differential data 0 signal
10. Pin 11 (Symbol D0N): Negative pin of MIPI low-voltage differential data 0 signal
11. Pin 13 (Symbol D1P): Positive pin of MIPI low-voltage differential data 1 signal
12. Pin 14 (Symbol D1N): Negative pin of MIPI low-voltage differential data 1 signal
13. Pin 16 (Symbol CLKP): Positive pin of MIPI low-voltage differential clock signal
14. Pin 17 (Symbol CLKN): Negative pin of MIPI low-voltage differential clock signal
15. Pin 19, 20, 22, 23 (Symbol NC): Reserved floating pins
16. Pin 25 (Symbol CTP_INT): Touch interrupt signal pin, level range 2.8~3.3V
17. Pin 26 (Symbol CTP_SDA): Touch I2C data signal pin, level range 2.8~3.3V
18. Pin 27 (Symbol CTP_SCL): Touch I2C clock signal pin, level range 2.8~3.3V
19. Pin 28 (Symbol CTP_RST): Touch reset signal input pin, level range 2.8~3.3V
20. Pin 29 (Symbol CTP-VCI): Touch unit power supply pin, supply range 2.8V~3.3V
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6. Reliability Test Standards

All factory units must pass the full set of environmental stress reliability verification. The specific test items and judgment rules are as follows:

• High-temperature storage test: Continuous placement for 96 hours in an 80°C environment
• Low-temperature storage test: Continuous placement for 96 hours in a -30°C environment
• High-temperature operation test: Continuous power-on operation for 96 hours in a 70°C environment
• Low-temperature operation test: Continuous power-on operation for 96 hours in a -20°C environment
• High-temperature and high-humidity storage test: Continuous placement for 96 hours in a 60°C, 90%RH environment
• Thermal shock test: Under static working conditions, 30 minutes at -20°C and 30 minutes at 70°C count as one cycle, repeated for 10 cycles
  After all tests are completed, the product must maintain full normal functionality. No defects such as missing segments, short circuits, blurry display, non-display state, display abnormality or liquid crystal leakage are allowed. Meanwhile, no issues including low-temperature bubbles, sealing edge peeling or frame rainbow patterns on the display screen shall occur.
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  The specific packaging scheme for this product is pending subsequent confirmation and supplementation.