Market Overview

Complete Teardown Report of Synaptics' Under-Display Fingerprint Scanner Inside the VIVO X21 UD Smartphone -


The "Synaptics'
Under-Display Fingerprint Scanner Inside the VIVO X21 UD Smartphone
Complete Teardown Report"
report has been added to's

Vivo is the first smartphone manufacturer to integrate a fingerprint
scanner under the display. Two different versions, one from Synaptics
and one from Goodix, were found to have been supplied for the
under-display fingerprint scanner integrated into the VIVO X21UD

This reverse costing study provides insight into technological data,
manufacturing cost, and selling price of the fingerprint sensor supplied
by Synaptics. This scanner uses optical fingerprint technology that
allows integration under the display. With a stainless steel support and
two flexible printed circuit layers, the Synaptics fingerprint sensor's
dimensions are 6.46 mm x 9.09 mm, with an application specific
integrated circuit (ASIC) driver in the flex module. This image sensor
is also assembled with a glass substrate where filters are deposited.

The sensor has a resolution of 30,625 pixels, with a pixel density of
777ppi. The module's light source is providing by the OLED display
glasses. The fingerprint module uses a collimator layer corresponding to
the layers directly deposited on the die sensor and composed of organic,
metallic and silicon layers. This only allows light rays reflected at
normal incidence to the collimator filter layer to pass through and
reach the optical sensing elements. The sensor is connected by wire
bonding to the flexible printed circuit and uses a CMOS process.

This report includes comparisons with the latest Huawei FPC1268
fingerprint touch sensor and a physical comparison with the Goodix
Version of Vivo's fingerprint scanner.

Key Topics Covered:

1. Overview/Introduction

  • Executive Summary
  • Reverse Costing Methodology

2. Company Profile

  • Synaptics

3. Physical Analysis

  • Summary of the Physical Analysis
  • VIVO X21 UD Fingerprint Scanner Disassembly
  • Synaptics Package Assembly

Sensor Die

  • Sensor die view and dimensions
  • ASIC Die

4. Synaptics vs Goodix Versions of the Fingerprint Sensors

5. Sensor Manufacturing Process

  • Sensor Die Front-End Process and Fabrication Unit
  • ASIC Die Front-End Process and Fabrication Unit
  • Final Test and Assembly Unit

6. Cost Analysis

  • Summary of the Cost Analysis
  • Yields Explanation and Hypotheses
  • ASIC Component
  • Sensor Module
  • Complete Module Fingerprint

7. Selling Price

8. Huawei's fingerprint sensor vs Vivo's

Companies Mentioned

  • Goodix
  • Huawei
  • Synaptics
  • Vivo

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