Dual-Emission Pixel Circuit Layout for Gray Scale Control
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Solution Overview
Problem
Existing display technologies using tiny LEDs face challenges in efficiently managing light-emitting area and luminous efficiency, particularly when displaying low and high gray scales, due to limitations in controlling separate light-emitting portions within a single device.
Innovation Solution
A light-emitting device with dual light-emitting portions, each controlled independently, is designed to optimize light-emitting area and efficiency by separately activating one or both portions based on the desired gray scale, utilizing a semiconductor layer structure with separate semiconductor patterns and electrode connections for stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single light-emitting portion is used in a tiny LED device, then the device structure remains simple, but the ability to independently control light-emitting area for different gray scales is limited
Solution Approach 1:
The light-emitting functional layer is divided into multiple light-emitting portions (first light-emitting pattern and second light-emitting pattern) that can be independently controlled. The semiconductor layer is segmented into corresponding semiconductor patterns (first and second semiconductor patterns) to enable separate electrical control of each light-emitting region, allowing independent adjustment for different gray scale requirements
Solution Approach 2:
Different regions of the light-emitting functional layer are assigned different properties through spatial segmentation. The first light-emitting portion and second light-emitting portion can operate with different current densities and luminous intensities simultaneously, enabling local optimization for different gray scale levels while maintaining overall device functionality
2Use of energy by moving object
If the light-emitting area is reduced for low gray scale display, then power consumption decreases, but current density must be significantly increased which may affect device reliability
Solution Approach 1:
The device segments the light-emitting area into controllable portions that can be selectively activated. For low gray scales, only a portion of the light-emitting regions are activated rather than reducing current through the entire device, thereby maintaining lower power consumption without requiring excessive current density in active regions
Solution Approach 2:
The device dynamically adjusts the active light-emitting area based on gray scale requirements. By switching between different combinations of light-emitting portions (first, second, or both), the device adapts its effective light-emitting area to match the desired brightness level, optimizing power consumption across different operating conditions
3Measurement precision
If separate control of multiple light-emitting portions is implemented, then gray scale control precision improves, but the electrode layer and connection structure become more complex
Solution Approach 1:
The electrode layer is segmented into corresponding electrode patterns that align with the segmented light-emitting portions. This segmentation enables independent electrical control of each light-emitting region through dedicated electrode connections, achieving precise gray scale control while maintaining a structured and organized electrode architecture
Solution Approach 2:
The segmented electrode structure serves multiple functions: it provides independent control pathways for different light-emitting portions, maintains electrical connections through the semiconductor layers, and enables both individual and combined operation of light-emitting regions. This multi-functionality reduces the need for additional specialized components
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 solution allows for reduced light-emitting area during low gray scale display while maintaining high efficiency by increasing current density, and simultaneous operation of both portions for high gray scales, enhancing overall display performance.
Implementation Method 1
The light-emitting functional layer is disposed on one of two opposite sides of the first semiconductor layer in a thickness direction of the first semiconductor layer. The light-emitting functional layer includes a first light-emitting pattern and a second light-emitting pattern spaced apart
Data Source
AI summary
A light-emitting device includes a first semiconductor layer, a light-emitting functional layer and a second semiconductor layer that are stacked. The first semiconductor layer includes a first semiconductor pattern and a second semiconductor pattern. The light-emitting functional layer includes a first light-emitting pattern and a second light-emitting pattern spaced apart. The second semiconductor layer includes a third semiconductor pattern and a fourth semiconductor pattern spaced apart. Orthographic projections of the first semiconductor pattern, the first light-emitting pattern and the third semiconductor pattern on a reference plane at least partially overlap to form a first light-emitting portion. Orthographic projections of the second semiconductor pattern, the second light-emitting pattern and the fourth semiconductor pattern on the reference plane at least partially overlap to form a second light-emitting portion. The reference plane is parallel to a plane where the first semiconductor layer is located.