Integrated Fingerprint Pixel Driving Circuit for Compact Displays
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Solution Overview
Problem
The existing display panels with separate fingerprint identification and pixel driving circuits occupy significant space, result in complex manufacturing processes, and are costly due to their separate arrangement.
Innovation Solution
A fingerprint identification pixel driving circuit that integrates fingerprint signal identification, drive reading, fingerprint signal reading, pixel charging, storage, and light emitting control elements, utilizing transistors and a piezoelectric layer to transmit and receive ultrasonic waves for fingerprint sensing, and control light emission, thereby combining the functions of both circuits into a single unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fingerprint identification circuit and pixel driving circuit are arranged separately, then each circuit can be independently designed and manufactured, but the display panel occupies more space and has higher manufacturing complexity and cost
Solution Approach 1:
The patent merges the fingerprint identification circuit and pixel driving circuit into a single integrated circuit structure. The fingerprint identification pixel driving circuit includes both fingerprint sensing elements (piezoelectric layers for transmitting and receiving ultrasonic waves) and pixel driving elements (transistors for controlling light emission) within the same circuit architecture, eliminating the need for separate circuit arrangements and reducing overall manufacturing complexity
Solution Approach 2:
The integrated circuit performs multiple functions simultaneously: it can identify fingerprints through ultrasonic wave transmission and reception, drive pixel elements for display, and control light emitting elements. This multi-functional design allows a single circuit to replace what would traditionally require separate dedicated circuits for each function
2Reliability
If fingerprint identification circuit and pixel driving circuit are arranged separately, then each circuit can be independently optimized, but the display panel has higher cost
Solution Approach 1:
By combining both circuits into one integrated structure, the patent reduces the total number of discrete components, interconnections, and assembly steps required. This integration directly lowers manufacturing cost while maintaining the reliability of both fingerprint identification and pixel driving functions through unified circuit design
3Reliability
If separate fingerprint identification circuit and pixel driving circuit are used, then each circuit can be independently tested, but the display panel has larger volume
Solution Approach 1:
The integration of both circuits into a single compact unit dramatically reduces the display panel volume. The fingerprint identification elements and pixel driving elements share the same circuit board and interconnection structure, eliminating the space required for separate circuit arrangements and reducing overall panel thickness and footprint
4Ease of repair
If separate fingerprint identification circuit and pixel driving circuit are arranged, then each circuit can be independently maintained, but the manufacturing process becomes more complex
Solution Approach 1:
The integrated circuit design simplifies the manufacturing process by reducing the number of separate fabrication steps, alignment operations, and assembly procedures required for mounting separate circuits. While maintenance access may be slightly more constrained, the unified structure eliminates the complexity of managing multiple independent circuit assemblies
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 integrated solution simplifies the manufacturing process, reduces costs, and allows for a more compact display panel design while maintaining fingerprint identification functionality.
Implementation Method 1
a piezoelectric layer, where a terminal of the piezoelectric layer is coupled to the first node, and another terminal of the piezoelectric layer is coupled to the second signal terminal
Implementation Method 2
generate a sensing signal by transmitting an ultrasonic wave and receiving a reflected ultrasonic wave
Data Source
AI summary
There is provided a fingerprint identification pixel driving circuit, including: a fingerprint signal identification element configured to transmit an ultrasonic wave and receive a reflected ultrasonic wave according to a voltage of a first node and a signal of a second signal terminal to generate a sensing signal; a drive reading element configured to drive a light emitting element according to the voltage of the first node and generate a sensing current according to the sensing signal; a fingerprint signal reading element configured to output the sensing current; a pixel charging element configured to write a signal of a data line terminal to a storage element; the storage element configured to store the sensing signal or the signal of the data line terminal; a light emitting control element configured to control light emitting of the light emitting element; and the light emitting element configured to emit light.