PMOS Emission Driver for Compact Electroluminescent Displays
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Solution Overview
Problem
Conventional electroluminescent displays, such as organic electroluminescent displays, are often large, heavy, and costly due to the need for both PMOS and NMOS transistors in their emission drivers, which complicates manufacturing and increases size and weight.
Innovation Solution
An emission driver and electroluminescent display utilizing only p-type or n-type transistors, specifically PMOS or NMOS transistors, with a simplified process that includes multiple signal processors to generate and control emission control signals, reducing complexity and size while maintaining efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both PMOS and NMOS transistors are used in the emission driver, then the display can achieve proper signal control and emission function, but the device size increases, weight increases, and manufacturing complexity increases
Solution Approach 1:
The patent applies homogeneity by using only PMOS transistors throughout the entire emission driver circuit, including all switching elements, signal processing units, and pixel drive circuits. This eliminates the need for NMOS transistors, simplifying the manufacturing process, reducing device complexity, and enabling monolithic integration while maintaining full signal control capability through proper circuit design
2Device complexity
If only PMOS or NMOS transistors are used, then manufacturing is simplified and device size is reduced, but additional external drivers or separate pixel formation may be required
Solution Approach 1:
The patent implements universality by designing the PMOS-based emission driver to perform multiple functions: signal processing, pixel driving, and emission control, all within a single integrated circuit. The circuit includes signal processing units that generate control signals and pixel drive circuits that directly drive the display pixels, eliminating the need for separate external drivers and enabling complete integration on one substrate
3Reliability
If conventional emission driver design is used with both transistor types, then proper emission control is achieved, but the display device becomes larger, heavier, and more expensive
Solution Approach 1:
The patent applies merging by integrating the emission driver circuit and pixel drive circuits into a single monolithic structure on one substrate using only PMOS transistors. This combines multiple functions into one unified device, reducing the overall display device size and weight while maintaining proper emission control through coordinated signal processing and pixel driving circuits
Data Source
AI summary
An emission driver may include a first signal processor adapted to receive a clock signal, an input signal and an inverse input signal, and to generate a first output signal, a second signal processor adapted to receive the first output signal, an inverse clock signal and negative feedback signals, and to generate a second output signal, a third signal processor adapted to receive the second output signal and the input signal, and to generate a third output signal that is an inverse signal to the second output signal, and a fourth signal processor adapted to receive the third output signal, and to generate a fourth output signal that is an inverse of the third output signal based on the third output signal, wherein the negative feedback signals include the third output signal and the fourth output signal.