Display Pixel Circuits for Integrated Light Sensing and Emission
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Solution Overview
Problem
Existing display devices lack integrated imaging capabilities while maintaining high display quality and functional versatility, such as touch sensitivity and fingerprint authentication.
Innovation Solution
Incorporation of light-receiving elements and light-emitting elements in a matrix within the display device, utilizing transistors with silicon and metal oxide semiconductor layers to facilitate image capture and display, allowing for integrated imaging and touch functionality without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If display devices are used only for displaying images, then display quality is maintained, but functional versatility is insufficient
Solution Approach 1:
The display device integrates multiple functions including image display, touch panel operation, and fingerprint authentication into a single device structure. The pixel electrodes serve dual purposes as both display elements and touch sensors, eliminating the need for separate imaging components and reducing overall device complexity while enhancing versatility.
Solution Approach 2:
The patent combines the display function and touch panel function into a single integrated structure where the same pixel electrodes are used for both image display and touch sensing. This merging eliminates the need for separate touch sensor layers and reduces device complexity.
2Adaptability or versatility
If separate imaging components are added to enable fingerprint authentication, then imaging function is improved, but device complexity increases
Solution Approach 1:
The pixel electrodes are designed to perform multiple functions: displaying images, detecting touch inputs, and capturing fingerprint images. This multi-functionality eliminates the need for separate imaging components such as dedicated cameras or sensors, thereby reducing device complexity while enabling comprehensive imaging capabilities.
Solution Approach 2:
The imaging function for fingerprint authentication is merged with the display and touch panel functions. The same pixel electrodes that display images also capture fingerprint images, combining multiple functions into a single integrated system rather than using separate components.
3Adaptability or versatility
If additional components are used for touch sensitivity and imaging, then functionality is enhanced, but component count increases
Solution Approach 1:
The pixel electrodes are designed as universal components that simultaneously serve as display elements, touch sensors, and imaging sensors for fingerprint authentication. This multi-functionality significantly reduces the total component count by eliminating the need for separate touch panel components and imaging sensors.
Solution Approach 2:
Multiple functions including display, touch sensing, and fingerprint imaging are merged into a single integrated pixel electrode structure. This consolidation reduces the number of separate components needed in the display device while maintaining all required functionalities.
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 high-quality image display and capture, reduces component count, and enhances user interaction through integrated imaging and touch sensitivity, particularly in low-light conditions.
Implementation Method 1
The light-receiving element includes a first pixel electrode, an active layer, and a common electrode
Implementation Method 2
Light-emitting elements utilizing electroluminescence (hereinafter referred to as EL elements) have features such as ease of reduction in thickness and weight, high-speed response to input signals, and capability of DC low voltage driving
Data Source
AI summary
A display device includes a first pixel circuit including a light-receiving element and a first transistor, and a second pixel circuit including a light-emitting element and a second transistor. The light-receiving element includes an active layer between a first pixel electrode and a common electrode, and the light-emitting element includes a light-emitting layer between a second pixel electrode and the common electrode. The first pixel electrode and the second pixel electrode are positioned on the same plane. The active layer and the light-emitting layer contain different organic compounds. A source or a drain of the first transistor is electrically connected to the first pixel electrode, and a source or a drain of the second transistor is electrically connected to the second pixel electrode. The first transistor includes a first semiconductor layer containing a metal oxide, and the second transistor includes a second semiconductor layer containing polycrystalline silicon.