Display Device Pixel Sensor Circuit for Biometric Recognition
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Solution Overview
Problem
Existing display devices lack an integrated solution for recognizing biometric information and sensing external inputs efficiently, often requiring separate components that increase complexity and thickness.
Innovation Solution
A display device with a biometric information recognition function and an input sensing function, incorporating a plurality of pixels and sensors. Each pixel includes a light emitting element and a pixel driving circuit, while each sensor includes a light receiving element and a sensor driving circuit, featuring transistors for reset, amplification, and output signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate input sensing layer is added to display device, then biometric information recognition and input sensing functions are achieved, but device thickness increases and manufacturing complexity increases
Solution Approach 1:
The patent merges the input sensing function with the existing display device structure by utilizing the pixel structure itself for sensing operations. The pixel circuit includes additional transistors (first output transistor and second output transistor) that enable the pixel to perform both display and sensing functions, eliminating the need for a separate input sensing layer and thereby reducing device thickness.
Solution Approach 2:
The pixel structure is designed to serve multiple functions: it acts as both a display element and a sensing element for biometric information recognition and external input detection. The sensor driving circuit shares the pixel structure while adding sensing capability through additional transistors, allowing one component to perform multiple functions without increasing overall device thickness.
2Adaptability or versatility
If separate input sensing layer is added to display device, then biometric information recognition and input sensing functions are achieved, but manufacturing complexity increases
Solution Approach 1:
The patent combines the sensing function with the existing pixel manufacturing process. The sensor driving circuit is integrated into the pixel structure using the same fabrication steps, and the additional transistors are formed during the normal pixel manufacturing sequence, avoiding the need for separate sensing layer fabrication and simplifying the overall manufacturing process.
3Measurement precision
If sensor driving circuit with multiple transistors is implemented, then sensing precision and functionality are improved, but circuit complexity increases
Solution Approach 1:
The sensor driving circuit uses the same pixel structure for both display and sensing operations. The additional transistors (first output transistor connected to first sensing node, second output transistor connected to second sensing node) enable the circuit to perform sensing functions while sharing the existing pixel infrastructure, thereby improving sensing precision without proportionally increasing overall circuit complexity.
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
The display device effectively recognizes biometric information and senses external inputs without the need for a separate input sensing layer, reducing thickness and simplifying manufacturing processes while maintaining efficient functionality.
Implementation Method 1
each of the plurality of pixels includes a light emitting element and a pixel driving circuit connected to the light emitting element
Implementation Method 2
each of the plurality of sensors includes a light receiving element and a sensor driving circuit connected to the light receiving element
Data Source
AI summary
A display device includes a plurality of pixels, each of which includes a light emitting element and a pixel driving circuit and a plurality of sensors, each of which includes a light receiving element and a sensor driving circuit. A sensor driving circuit included in at least one of sensors includes a reset transistor configured to output a reset signal to a first sensing node in response to a reset control signal, an amplification transistor connected to first and second sensing nodes and configured to receive a sensor driving voltage, a first output transistor connected between the second sensing node and a readout line and configured to receive a first output control signal, and a second output transistor connected between the second sensing node and the readout line and configured to receive a second output control signal.