# US 2018/0322323 A1 · Fingerprint module and mobile terminal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0322323 A1 - Document ID: US20180322323A1 - Status: Published application - Kind: A1 - Application number: 15/704,065 - Filed: 2017-09-14 - Published: 2018-11-08 - Earliest claimed: 2017-05-05 - Assignees: Shenzhen Goodix Technology Co., Ltd. - Applicants: Shenzhen Goodix Technology Co., Ltd. - Inventors: Rui RAN; Dansheng CHEN - Web page: https://patentgrep.com/patent/US20180322323A1 ## CPC - G06F 3/041: Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means - G01L 9/06: of piezo-resistive devices - G06F 1/1684: {Constructional details or arrangements related to integrated I/O peripherals not covered by groups G06F1/1635 - G06F1/1675} - G06F 3/0412: {Digitisers structurally integrated in a display} - G06V 40/1306: {non-optical, e.g. ultrasonic or capacitive sensing} - G06V 40/1365: {Matching; Classification} - H04M 1/026: {Details of the structure or mounting of specific components} - G06F 2203/04105: Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position - H04M 2250/12: including a sensor for measuring a physical value, e.g. temperature or motion - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G) - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING - H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08) ## Abstract A fingerprint module includes a fingerprint identification chip, a flexible circuit board, and a pressure detection unit. The pressure detection unit includes a rigid substrate and a pressure detection circuit formed on the rigid substrate. The fingerprint identification chip and the pressure detection unit are disposed on two opposite surfaces of the flexible circuit board respectively, and are separately electrically connected to the flexible circuit board, respectively. ## Claims ### Claim 1 A fingerprint module, comprising: a fingerprint identification chip; a flexible circuit board; and a pressure detection unit; wherein the pressure detection unit comprises a rigid substrate and a pressure detection circuit formed on the rigid substrate; and wherein the fingerprint identification chip and the pressure detection unit are arranged on two opposite surfaces of the flexible circuit board, respectively, and are electrically connected to the flexible circuit board, respectively. ### Claim 2 (depends on 1) The fingerprint module according to claim 1, wherein the rigid substrate is any one of the following: a ceramic substrate, a polyimide substrate, an epoxy glass fiber substrate, a glass substrate, and a quartz substrate. ### Claim 3 (depends on 2) The fingerprint module according to claim 2, wherein the rigid substrate comprises a zirconium oxide ceramic substrate. ### Claim 4 (depends on 3) The fingerprint module according to claim 3, wherein the zirconium oxide ceramic substrate has a thickness in a range between 0.08 millimeters and 0.1 millimeters. ### Claim 5 (depends on 1) The fingerprint module according to claim 1, wherein: a contact area, where contacts of the pressure detection circuit are located, is connected to the flexible circuit board via a conductive adhesive; and on a surface of the rigid substrate facing the flexible circuit board, an other area than the contact area is connected to the flexible circuit board via an insulation adhesive. ### Claim 6 (depends on 1) The fingerprint module according to claim 1, wherein the pressure detection unit is arranged at a position of the flexible circuit board corresponding to the fingerprint identification chip. ### Claim 7 (depends on 1) The fingerprint module according to claim 1, wherein the pressure detection circuit comprises a half-bridge piezoresistive sensing unit on the rigid substrate. ### Claim 8 (depends on 7) The fingerprint module according to claim 7, wherein the half-bridge piezoresistive sensing unit comprises two bridge arms connected in series, wherein: a resistor unit of one bridge arm is located on a surface of the rigid substrate facing the flexible circuit board; and a resistor unit of the other bridge arm is located on a surface of the rigid substrate away from the flexible circuit board. ### Claim 9 (depends on 1) The fingerprint module according to claim 1, wherein the pressure detection circuit comprises a full-bridge piezoresistive sensing unit on the rigid substrate. ### Claim 10 (depends on 9) The fingerprint module according to claim 9, wherein the full-bridge piezoresistive sensing unit comprises two half-bridge piezoresistive sensing units connected in parallel; each half-bridge piezoresistive sensing unit comprises two bridge arms connected in series; and resistor units of the bridge arms that are diagonally positioned are located on a same surface of the rigid substrate. ### Claim 11 (depends on 1) The fingerprint module according to claim 1, wherein the pressure detection circuit is formed with full-bridge piezoresistive sensing units on a surface of the rigid substrate facing the flexible circuit board and a surface of the rigid substrate away from the flexible circuit board, respectively. ### Claim 12 (depends on 1) The fingerprint module according to claim 1, wherein the pressure detection circuit is formed on the rigid substrate in any one of the following manners: printing, spraying, and electroplating. ### Claim 13 A mobile terminal, comprising a fingerprint module, the fingerprint module comprising: a fingerprint identification chip; a flexible circuit board; and a pressure detection unit; wherein the pressure detection unit comprises a rigid substrate and a pressure detection circuit formed on the rigid substrate; and wherein the fingerprint identification chip and the pressure detection unit are arranged on two opposite surfaces of the flexible circuit board, respectively, and are electrically connected to the flexible circuit board, respectively. ### Claim 14 (depends on 13) The mobile terminal according to claim 13, wherein the mobile terminal further comprises a cover, and the cover is disposed above the fingerprint module. ### Claim 15 (depends on 14) The mobile terminal according to claim 14, wherein the mobile terminal further comprises a display panel, and the display panel is disposed between the cover and the fingerprint module. ### Claim 16 (depends on 13) The mobile terminal according to claim 13, wherein the rigid substrate is any one of the following: a ceramic substrate, a polyimide substrate, an epoxy glass fiber substrate, a glass substrate, and a quartz substrate. ### Claim 17 (depends on 13) The mobile terminal according to claim 13, wherein the rigid substrate comprises a zirconium oxide ceramic substrate. ### Claim 18 (depends on 17) The mobile terminal according to claim 17, wherein the zirconium oxide ceramic substrate has a thickness in a range between 0.08 millimeters and 0.1 millimeters. ### Claim 19 (depends on 13) The mobile terminal according to claim 13, wherein a contact area, where contacts of the pressure detection circuit are located, is connected to the flexible circuit board via a conductive adhesive; and on a surface of the rigid substrate facing the flexible circuit board, an other area than the contact area is connected to the flexible circuit board via an insulation adhesive. ### Claim 20 (depends on 13) The fingerprint module according to claim 13, wherein the pressure detection unit is arranged at a position of the flexible circuit board corresponding to the fingerprint identification chip.