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Synaptics’ Under-Display Fingerprint Scanner Inside the VIVO X21 UD Smartphone

3 490 €

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SP18419 VIVO X21 UD Fingerprint Under Display flyer couv

Optical fingerprint technology allows integration behind the display.

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 X21 UD smartphone.

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.

SP18419 VIVO X21 UD Fingerprint Touch Sensor image1

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 correspon-

ding 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.


  SP18419 Package Opening image2SP18419 Filter Deposition on Glass Substrate image4 SP18419 ASIC Die Overview image3










Table of contents


> Executive Summary

> Reverse Costing Methodology



Company Profile

> Synaptics



Physical and Manufacturing Cost Analysis

> Summary of the Physical Analysis

> VIVO X21 UD Fingerprint Scanner Disassembly

- Fingerprint Scanner Removal

> Synaptics Package Assembly

- Fingerprint scanner views

- Fingerprint scanner cross-section

- Fingerprint scanner patents

> Sensor Die

- Sensor die view and dimensions

- Sensor delayering and main blocks

- Sensor die process

- Sensor die cross-section

- Sensor die process characteristic

 > ASIC Die

- ASIC die view and dimensions

- ASIC delayering and main block

- ASIC die process

- ASIC die cross-section

- ASIC die process characteristic



Synaptics vs Goodix Versions of the Fingerprint Sensors














































Sensor Manufacturing Process

> Sensor Die Front-End Process and Fabrication Unit

> ASIC Die Front-End Process and Fabrication Unit

> Final Test and Assembly Unit



Sensor Manufacturing Process

> Summary of the Cost Analysis

> Yields Explanation and Hypotheses

> ASIC Component

- ASIC die front-end cost

- Sensor die probe test, thinning and dicing

- ASIC component cost

> Sensor Module

- Sensor die front-end cost

- Collimator filter front-end cost

- Sensor die probe test, thinning and dicing

- Sensor die wafer cost

- Sensor die cost

- Sensor module cost

> Complete Module Fingerprint

- Assembled components cost

- Summary of the assembly

- Fingerprint component cost



Selling Price



Huawei’s fingerprint sensor vs Vivo’s


About the authors


System Plus Consulting specializes in the cost analysis of electronics, from semiconductor devices to electronic systems.

Created more than 20 years ago, System Plus Consulting has developed a complete range of services, costing tools and reports to deliver in-depth production cost studies and estimate the objective selling price of a product.

System Plus Consulting engineers are experts in:

  • Integrated Circuits 
  • Power Devices & Modules 
  • MEMS & Sensors
  • Photonics 
  • LED 
  • Imaging 
  • Display 
  • Packaging 
  • Electronic Boards & Systems.

Through hundreds of analyses performed each year, System Plus Consulting offers deep added-value reports to help its customers understand their production processes and determine production costs. Based on System Plus Consulting’s results, manufacturers are able to compare their production costs to those of competitors.

System Plus Consulting is a sister company of Yole Développement.

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  • Detailed photos

  • Precise measurements

  • Materials analysis
  • Manufacturing process flow

  • Supply chain evaluation
  • Manufacturing cost analysis

  • Selling price estimate

  • Comparison with Huawei FPC1268 fingerprint scanner and short comparison with the Goodix version