Active Matrix Pixel Circuit with Light Emitting Device for Sensing
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Solution Overview
Problem
Existing display devices face challenges in miniaturization due to the need for additional circuits for multifunctionality, such as ambient light sensing and touch panels, which increase device size and weight.
Innovation Solution
An electronic apparatus that integrates light emission and sensing functions into a single light-emitting device within each pixel, using a pixel circuit with specific transistor configurations and bias control to enable both light emission and sensing, allowing for active matrix driving and reducing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional circuits are mounted in display devices to provide multifunctionality (ambient light sensing, touch panels), then the device can perform multiple functions, but the size and weight of the device increase
Solution Approach 1:
The patent combines light emission and light sensing functions into a single light-emitting device within each pixel. The light-emitting device can operate in two modes: emitting light when forward-biased and sensing light when reverse-biased. This merging eliminates the need for separate sensing circuits, thereby reducing device weight while maintaining multifunctionality
Solution Approach 2:
The light-emitting device is designed to perform multiple functions: it serves as both a light source for display and a light sensor for sensing applications. By making the light-emitting device universal, the patent reduces the total number of components needed, directly addressing the weight reduction goal while preserving adaptability
2Adaptability or versatility
If additional circuits are mounted in display devices to provide multifunctionality, then the device can perform multiple functions, but the size of the device increases
Solution Approach 1:
The patent merges light emission and sensing functions into the same pixel-level light-emitting device, eliminating separate sensing circuits and components. This integration significantly reduces the device area required for multifunctionality
Solution Approach 2:
By making the light-emitting device universal (capable of both emission and sensing), the patent reduces the total component count and device area, as the same physical structure serves multiple purposes without requiring additional space
3Device complexity
If passive matrix driving is used for light emission and sensing, then the device structure is simpler, but the light intensity detection time is longer and accuracy is reduced due to higher crosstalk
Solution Approach 1:
The patent employs active matrix driving with dynamic control of the light-emitting devices, allowing each pixel to be independently controlled and sensed. This dynamic approach enables faster detection times and reduced crosstalk compared to static passive matrix driving, improving measurement precision while managing complexity through standardized pixel circuits
4Device complexity
If passive matrix driving is used for light emission and sensing, then the device structure is simpler, but the detection time of light intensity change is longer
Solution Approach 1:
Active matrix driving enables dynamic and independent control of each pixel, allowing for faster switching and detection operations. This reduces the detection time of light intensity changes compared to the slower, sequential nature of passive matrix driving, while the standardized pixel circuit design keeps the overall complexity manageable
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 approach enables miniaturization and weight reduction while shortening light intensity detection time and improving accuracy compared to passive matrix driving methods.
Implementation Method 1
a sensing driver configured to apply a non-forward bias to the light-emitting device in a sensing mode to control an electrical signal corresponding to light incident on the light-emitting device to be generated
Data Source
AI summary
Disclosed are an active matrix-based electronic apparatus and a method of driving the same. More particularly, a pixel circuit of an electronic apparatus according to an embodiment of the present disclosure may include a light-emitting driver configured to apply a forward bias to a light-emitting device in an emission mode to control light to be emitted through the light-emitting device; a sensing driver configured to apply a non-forward bias to the light-emitting device in a sensing mode to control an electrical signal corresponding to light incident on the light-emitting device to be generated; and a reader configured to read intensity of light corresponding to the generated electrical signal.