Display Driver TFT Mix for Simpler Manufacturing and Efficient Scanning
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Solution Overview
Problem
Existing display apparatuses, particularly LED displays, face complexity in manufacturing due to the need for different processes for data and scan drivers, which affects driving efficiency and increases production complexity.
Innovation Solution
The use of different types of Thin Film Transistors (TFTs) for data and scan drivers, such as Low-Temperature Polycrystalline Silicon (LTPS) TFTs for higher electron mobility and Amorphous Silicon (a-Si) TFTs for precise current selection, along with a multiplexer to reduce wiring complexity and enhance signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the same type of TFT is used for both data driver and scan driver, then the manufacturing process is simplified, but the driving efficiency of light emitting elements is reduced
Solution Approach 1:
The patent applies different TFT types to different functional blocks: LTPS TFTs for the scan driver to achieve high electron mobility and fast switching, and a-Si TFTs for the data driver to achieve precise current control. This local differentiation resolves the contradiction by optimizing each driver's performance characteristics according to its specific functional requirements while maintaining a unified manufacturing approach where possible.
2Productivity
If different types of TFTs are used for data driver and scan driver, then the driving efficiency is improved, but the production complexity increases
Solution Approach 1:
The patent changes the material parameter of TFTs from uniform amorphous silicon to a combination of LTPS and a-Si with different electron mobility characteristics. LTPS TFTs provide high electron mobility for scan driver operations, while a-Si TFTs provide stable electrical characteristics for data driver current control. This parameter differentiation enables improved driving efficiency while the manufacturing process manages production complexity through established semiconductor fabrication techniques.
3Measurement precision
If multiple wirings are used to transmit signals to each pixel, then the signal transmission accuracy is improved, but the substrate wiring complexity increases
Solution Approach 1:
The patent merges multiple signal transmission functions into unified wiring structures. The scan driver controls multiple pixels through shared scan lines, and the data driver manages data signals through organized data lines with controlled impedance. This merging approach maintains signal transmission accuracy through proper electrical design while significantly reducing substrate wiring complexity compared to dedicated individual connections for each pixel.
Data Source
AI summary
A display apparatus includes a substrate; a plurality of pixels arranged in a two-dimensional matrix on the substrate; a plurality of scan lines configured to be connected in the plurality of pixels; a scan driver Integrated Chip (IC) configured to transmit a scan signal to the plurality of scan lines, and including at least one first Thin Film Transistor (TFT); a plurality of data lines configured to be connected in the plurality of pixels; and a data driver IC configured to transmit a data signal to the plurality of data lines, and including at least one second TFT, wherein the first TFT and the second TFT may be different types.