Touch Display Panel With Shared Common Electrode For Fingerprint Recognition

Solution Overview

Problem

Conventional touch display panels with integrated fingerprint recognition devices face high manufacturing costs and interference with image display due to silicon substrates, which are not light-transmitting materials, and expand the non-display zone when placed in peripheral frames.

Innovation Solution

A touch display panel design that integrates touch detection and fingerprint recognition zones within a shared common electrode layer, allowing for time-sharing operations using a driver integrated circuit, eliminating the need for a separate fingerprint recognition device and reducing manufacturing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a separate fingerprint recognition device with silicon substrate is integrated into the touch display panel, then fingerprint recognition function is achieved, but manufacturing cost increases and image display is affected due to non-light-transmitting material

Engineering Contradiction:

Improvefingerprint recognition functionVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent merges the fingerprint recognition electrode with the common electrode layer of the touch display panel, eliminating the need for a separate fingerprint recognition device. The common electrode layer serves dual purposes: as part of the display structure and as the fingerprint recognition sensing electrode, thereby reducing manufacturing costs and avoiding the use of non-light-transmitting silicon substrates.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The common electrode layer is designed to perform multiple functions: it serves as both the common electrode for the liquid crystal display and as the fingerprint recognition sensing electrode. This multi-functional design eliminates the need for additional dedicated fingerprint recognition components, reducing overall device complexity and manufacturing cost.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If a separate fingerprint recognition device with silicon substrate is integrated into the touch display panel, then fingerprint recognition function is achieved, but image display quality deteriorates due to blocking of light transmission

Engineering Contradiction:

Improvefingerprint recognition functionVSAvoidimage display quality

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

The patent merges the fingerprint recognition electrode with the common electrode layer of the touch display panel, eliminating the need for a separate fingerprint recognition device. The common electrode layer serves dual purposes: as part of the display structure and as the fingerprint recognition sensing electrode, thereby reducing manufacturing costs and avoiding the use of non-light-transmitting silicon substrates.

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If a separate fingerprint recognition device is placed in the peripheral frame zone, then fingerprint recognition function is achieved, but the non-display zone area expands

Engineering Contradiction:

Improvefingerprint recognition functionVSAvoidnon-display zone area

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The patent merges the fingerprint recognition electrode with the common electrode layer of the touch display panel, eliminating the need for a separate fingerprint recognition device. The common electrode layer serves dual purposes: as part of the display structure and as the fingerprint recognition sensing electrode, thereby reducing manufacturing costs and avoiding the use of non-light-transmitting silicon substrates.

Inventive Principle:

Principle #5Merging (Combining)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables effective integration of fingerprint recognition and touch display functions without additional hardware, reducing manufacturing costs and maintaining image display quality by using a shared common electrode layer for capacitive coupling and data acquisition.

Implementation Method 1

the pixel electrodes arranged in the pixel units function as a drive pixel layer, which induces capacitive coupling with respect to the fingerprint recognition electrodes arranged in the fingerprint recognition units, the driver integrated circuit acquiring information of fingerprint feature by detecting information of capacitance variation of the fingerprint recognition units

Methodology Applied

Scientific EffectCapacitive coupling: Capacitance

Data Source

PatentUS10739900B2Touch display panel having fingerprint recognition device integrated therewith and touch display device including same

Publication Date: 2020.08.11 WUHAN CHINA STAR OPTOELECTRONICS TECH CO LTD

AI summary

A touch display panel includes touch detection electrodes and fingerprint recognition electrodes that share a common electrode layer. The pixel electrodes function as a drive pixel layer to induce capacitive coupling with respect to the fingerprint recognition electrodes, based on which operations of displaying, touch detection, and fingerprint recognition are carried out in a time sharing manner. The touch display panel requires no integration of separately made fingerprint recognition device and a touch display panel, and fingerprint detection can be realized with an existing layered structure of the touch display panel to thereby effectively save the manufacturing cost of the touch display device and achieve an effect of integrating a fingerprint recognition device and a touch display panel. A touch display device that includes the touch display panel is also provided.