Scan Model And Theory Research For Flat Panel Display

The high resolution flat panel display technology has been one of the key scientific research fields in China. Gray scale is an important parameter to measure the display quality of flat panel display. Currently, pulse width modulation (PWM) is a common method to control gray scale of flat panel display.Apart from the research on display materials and devices, the increasing demand of new generation flat panel display with large size, super high resolution, quality and stability urges a systematic analysis and evaluation of various display scan methods—a theoretical research on scan imaging process and mechanism—to deduce new scan methods and hardware implementations appropriate for current flat panel display technology. Thus, the author has built up the mathematical scan model and its theory, upon which high grayscale and frame frequency scan schemes are investigated. The contributions and achievements of the work are as follows:1. Probe into the possibility and approach of constructing mathematical model for general logic circuits. A state combination tool based on set theory and a matrix-based tool are devised. These mathematical tools help analyze the circuit's current state, timing change and other characteristics. They can also aid the circuit designs.2. A generic theoretical scan model and its theory have been established to describe any scan method. Based on the proposal of common circuit model principle, the author describes the state variables (e.g. gray scale, storage, driver) and their relations by the state combination tool, the image set and its imaging process by matrix-based tool, analyzes scan imaging effect, and brings forward performance parameters. They lay the foundation for the optimization and deduction of the scan methods.3. Research on the scan operations and characteristic scan. Based on the extension to array operation, the author investigates the relationship between different scan functions, proposes various scan operations and constructs scan extension diagrams. It is pointed out that any scan can be separated into a characteristic scan and a combination of some scan operations. This viewpoint serves as a theory basis for the form and implementation of the scan methods.4. Research on regular scan and its strategy for high performance. The switch-driven regular scan and its property are investigated and four regular scan schemes proposed. Their formulae and performance analyses are also presented. It is discovered that implantation recursive operation is the optimal scheme for high gray scale and frame frequency implementation.5. Research on logic circuit implementation of scan core module and its system organization. The author defines the scan core module interface and designs a serial of column scan operation circuits. They can be conveniently organized for a fast and reliable construction of a scan system. Finally, a complete implementation process of the scan system has been verified by a flat panel display example.