Display Driving Circuit Using Single Crystal Silicon Switches
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Solution Overview
Problem
Display panels using amorphous or polycrystalline silicon thin film transistors face limitations in electron mobility and power consumption, leading to reduced efficiency and increased mura defects due to high channel resistance and low switching speed.
Innovation Solution
A display driving circuit that includes a controller, data driver, and data switching circuit to time-divisionally control pixel groups, using single crystal silicon switches to enhance operation speed and reduce power consumption, while omitting high voltage conversion and I/O pads to minimize bezel space and design constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If amorphous silicon TFT is used in display panel, then manufacturing is easier, but electron mobility is low and channel resistance is high
Solution Approach 1:
The patent changes the material parameter from amorphous silicon to single crystal silicon, fundamentally altering the electrical properties. Single crystal silicon provides higher electron mobility and lower channel resistance while maintaining manufacturability through established semiconductor fabrication processes.
2Reliability
If polycrystalline silicon TFT is used in display panel, then electron mobility is higher than amorphous silicon, but homogeneity is lower and threshold voltage distribution difference occurs
Solution Approach 1:
The patent transitions from polycrystalline silicon to single crystal silicon, eliminating grain boundaries and crystalline defects that cause threshold voltage variations. Single crystal silicon provides uniform electrical properties across the entire substrate, ensuring consistent TFT performance and preventing mura defects.
3Speed
If single crystal silicon switches are used, then operation speed increases and power consumption decreases, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates unnecessary components including high voltage conversion circuits and I/O pads. By using single crystal silicon switches that operate directly at the required voltage level, the design removes intermediate conversion stages, reducing device complexity while maintaining high switching speed and low power consumption.
4Reliability
If high voltage conversion and I/O pads are included, then signal transmission is ensured, but bezel space increases and design freedom is reduced
Solution Approach 1:
The patent removes high voltage conversion circuits and I/O pads from the display panel structure. Single crystal silicon switches handle signal transmission directly without requiring external conversion components, thereby minimizing bezel space and maximizing design freedom while ensuring reliable signal transmission.
Data Source
AI summary
A display apparatus including a display driving circuit and a display panel is provided. The display driving circuit, connected to a display panel including a plurality of pixel groups, includes a controller configured to determine a driving order of each of the plurality of pixel groups in a first horizontal period and to generate image data and a selection signal in a first voltage range, a data driver configured to generate an image signal on the basis of the image data and to transfer the image signal to the plurality of data lines in the first horizontal period, a plurality of output pads respectively connected to the plurality of pixel groups through the plurality of data lines, and a data switching circuit configured to provide the image signal to the display panel through at least one of the plurality of output pads based on the selection signal.