Display Drive Circuit Using Mixed-Mobility Transistors for Higher Definition
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Solution Overview
Problem
The challenge is to miniaturize the drive circuit of an organic electroluminescence (EL) display apparatus without deteriorating the display performance and achieving higher definition.
Innovation Solution
The proposed solution involves a display apparatus with a drive circuit that includes a drive transistor, a video signal writing transistor, and a capacitative element. The drive transistor and video signal writing transistor are designed with different carrier mobilities, where the drive transistor is a thin film transistor (TFT) and the video signal writing transistor is a MOS transistor formed on a silicon semiconductor substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the drive circuit is miniaturized to achieve higher definition, then the display resolution is improved, but the display performance deteriorates
Solution Approach 1:
The patent applies local quality by using two different types of transistors with different carrier mobilities in specific locations within the drive circuit. The first transistor (with lower carrier mobility) is used for the drive transistor, while the second transistor (with higher carrier mobility) is used for the video signal writing transistor. This localized differentiation allows the circuit to maintain proper signal writing and drive functions even when miniaturized, thus preserving display performance while achieving higher definition.
2Loss of information
If transistors with different carrier mobilities are used, then signal quality is maintained, but device complexity increases
Solution Approach 1:
The patent changes the carrier mobility parameter of the transistors used in the drive circuit. By selecting transistors with different carrier mobility characteristics (first transistor with lower mobility, second transistor with higher mobility), the circuit maintains optimal signal writing and drive performance. This parameter differentiation allows the miniaturized circuit to preserve signal quality without requiring excessive complexity in other circuit elements.
Data Source
AI summary
Light emitting devices for display apparatuses and electronic devices are disclosed. In one example, a light emitting device comprises a light emitting element, a first transistor, a second transistor, and a capacitive element, wherein the first transistor and the second transistor are different in carrier mobility.