OLED Pixel Circuit Logic Layout for Fewer Control Wirings
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Solution Overview
Problem
Current semiconductor devices and display apparatuses face challenges in achieving downsized, high-definition, high-quality, reliable, and low-power consumption designs while maintaining high color reproducibility.
Innovation Solution
A semiconductor device comprising specific transistor configurations, including n-channel and p-channel transistors with metal oxide semiconductor layers, and an organic EL element with a tandem structure, connected through a logic circuit to control the display element's emission intensity, allowing for efficient power management and high-definition display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display resolution is increased to achieve high-definition display, then the display quality is improved, but the device size increases
Solution Approach 1:
The pixel circuit is divided into multiple functional blocks including driving transistor section, switching transistor section, logic circuit section, and capacitor sections. Each block performs a specific function and can be independently optimized, allowing high-resolution display capability while maintaining compact overall circuit area through efficient functional segmentation.
2Reliability
If more transistors are added to improve display quality and color reproducibility, then the display performance is improved, but the circuit area increases
Solution Approach 1:
Multiple circuit functions are merged into integrated blocks. The driving transistor section combines threshold voltage correction and current control functions. The logic circuit section integrates multiple logic operations (AND, OR, NOT) that control pixel activation. Capacitor sections serve multiple purposes including charge storage and voltage level maintenance, reducing the need for separate dedicated components.
Solution Approach 2:
Transistors are designed with multi-functional capabilities. The driving transistor not only controls current flow but also performs threshold voltage correction. Switching transistors handle multiple signal routing functions. The logic circuit transistors perform both logic operations and signal transmission, allowing a compact design that achieves high display quality without proportionally increasing circuit area.
3Measurement precision
If the organic EL element structure is optimized for high definition, then the display quality is improved, but the manufacturing complexity increases
Solution Approach 1:
The organic EL element employs a tandem structure where multiple light-emitting layers are nested within a single device architecture. Each layer contains organic compounds with specific properties arranged in nested configurations, allowing high-definition display through multiple emission layers while using a unified manufacturing process for the entire tandem structure rather than requiring separate fabrication for each layer.
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 enables a downsized, high-definition display apparatus with improved color reproducibility, reliability, and reduced power consumption, achieving efficient power management and high-quality display performance.
Implementation Method 1
By voltage application to this element, light emission can be obtained from the light-emitting organic compound
Data Source
AI summary
An object is to provide a semiconductor device in which the number of control wirings is reduced. In a semiconductor device of one embodiment of the present invention, a first wiring (GLa) is connected to a first input terminal (54a) of a logic circuit (54) and a gate of a sixth transistor (M6); a second wiring (GLb) is connected to a second input terminal (54b) of the logic circuit (54), a gate of the third transistor (M3), a gate of the fourth transistor (M4), and a gate of the fifth transistor (M5); a gate of the first transistor (M1) is connected to an output terminal (54y) of the logic circuit (54); and the logic circuit (54) has a function of outputting a signal obtained by a logic operation of a signal input to the first input terminal (54a) and a signal input to the second input terminal (54b) to the output terminal (54y).