Composite Display Driving Circuit for High-Resolution Fingerprint Sensing

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Solution Overview

Problem

The complexity of driving circuits in optical fingerprint recognition display panels is increased due to separate pixel and fingerprint recognition circuits, leading to complications in design and potential reductions in pixel driving circuit size and resolution.

Innovation Solution

A composite driving circuit is introduced, where the pixel driving circuit and optical detection driving circuit are partially overlapped, sharing transistors and signal lines, allowing for integrated operation and reducing the size constraints on individual circuits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If separate pixel driving circuits and optical detection driving circuits are provided, then functional independence is improved, but device complexity increases

Engineering Contradiction:

Improvefunctional independenceVSAvoiddriving circuit complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines the pixel driving circuit and optical detection driving circuit into a single composite driving circuit. The first pixel driving circuit includes a driving transistor and first light-emitting control transistor, while the optical detection driving circuit includes an output control transistor. These circuits share common components such as the gate electrode of the first light-emitting control transistor being electrically connected to the gate electrode of the output control transistor, reducing overall device complexity while maintaining functional independence through separate circuit paths.

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If separate pixel driving circuit and optical detection driving circuit are provided, then functional independence is improved, but pixel driving circuit size decreases

Engineering Contradiction:

Improvefunctional independenceVSAvoidpixel driving circuit size

Core Design Contradiction:

Adaptability or versatilityVSArea of moving object

Solution Approach 1:

The composite driving circuit merges the pixel driving circuit and optical detection driving circuit into a single integrated structure. By sharing common components such as the gate electrode connection between the first light-emitting control transistor and output control transistor, the patent reduces the total area occupied by these circuits compared to having completely separate circuits, while still maintaining functional independence.

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If separate pixel driving circuit and optical detection driving circuit are provided, then functional independence is improved, but resolution decreases

Engineering Contradiction:

Improvefunctional independenceVSAvoiddisplay resolution

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent integrates the pixel driving circuit and optical detection driving circuit into a composite structure that shares common components. This integration reduces the overall circuit footprint and allows for tighter spacing between pixels, thereby maintaining or improving display resolution while preserving functional independence through separate circuit paths for each function.

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

This integration ensures stable driving processes for light-emitting elements, maintains high resolution, and reduces issues like crosstalk and insufficient charging, while enabling higher display panel resolution and efficient optical detection for fingerprint recognition.

Implementation Method 1

the composite functional material layer includes a photoelectric conversion material layer

Methodology Applied

Scientific EffectPhotoelectric conversion: Photovoltaic Effect

Implementation Method 2

the composite functional material layer includes a photoelectric conversion material layer and an electroluminescent material layer

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20260031043A1Display panel

Publication Date: 2026.01.29 BOE TECHNOLOGY GROUP CO LTD

AI summary

A display panel is provided. The display panel includes composite driving circuits, and light-emitting elements and photodetectors driven by the composite driving circuits, and the composite driving circuit includes a first pixel driving circuit for driving the light-emitting element and an optical detection driving circuit for driving the photodetector. The first pixel driving circuit includes a driving transistor and a first light-emitting control transistor. The optical detection driving circuit includes an output control transistor. In a same composite driving circuit, the first pixel driving circuit and the optical detection driving circuit are at least partially overlapped with each other in a direction perpendicular to the display panel, and a gate electrode of the first light-emitting control transistor of the first pixel driving circuit is electrically connected to a gate electrode of the output control transistor of the optical detection driving circuit.