Display Pixel Capacitance and Electrode Layout for Low-Grayscale Quality
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Solution Overview
Problem
The image quality of display apparatuses deteriorates when driven at extremely low grayscales.
Innovation Solution
A display apparatus design that includes a display panel with specific pixel configurations, such as non-overlapping gate and second transistor electrodes, varying pixel capacitances, and optimized transistor structures to improve image quality at low grayscales.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional OLED display is driven at extremely low grayscale, then power consumption is reduced, but image quality deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the capacitance values of specific pixels based on their color characteristics. Red and green pixels are assigned higher capacitance values (200fF-300fF) while blue pixels receive lower capacitance values (100fF-200fF), optimizing each pixel's performance for low grayscale operation without uniformly increasing complexity across all pixels
Solution Approach 2:
The patent changes the capacitance parameter of pixels to improve low grayscale image quality. By adjusting the storage capacitance values differently for red, green, and blue pixels based on their specific electrical characteristics, the system maintains better image quality at low grayscales while managing power consumption effectively
2Area of moving object
If the gate electrode and second electrode overlap in the transistor structure, then the transistor area is reduced, but the capacitance control precision deteriorates
Solution Approach 1:
The patent resolves the overlap issue by transitioning to a non-overlapping spatial arrangement of the gate electrode and second electrode. This dimensional separation eliminates parasitic capacitance while maintaining compact transistor design, achieving both area efficiency and precise capacitance control
Solution Approach 2:
The patent extracts the harmful overlapping region between the gate electrode and second electrode, removing the source of parasitic capacitance. This separation allows independent optimization of each electrode's position and dimensions for precise capacitance control
3Device complexity
If uniform capacitance is provided for all pixels, then the device complexity is reduced, but the image quality at low grayscale deteriorates
Solution Approach 1:
The patent implements local quality by assigning different capacitance values to pixels based on their color characteristics. Red and green pixels receive higher capacitance (200fF-300fF) while blue pixels receive lower capacitance (100fF-200fF), optimizing each pixel's performance for low grayscale operation
Solution Approach 2:
The patent changes the capacitance parameter across different pixel types to improve low grayscale image quality. By adjusting storage capacitance values according to the electrical characteristics of red, green, and blue pixels, the system achieves better image quality without excessive complexity increase
Data Source
AI summary
A display apparatus includes a display panel in which a plurality of data lines, a plurality of gate lines, and a plurality of pixels are arranged, a gate driving circuit connected to the plurality of gate lines, and a data driving circuit connected to the plurality of data lines, wherein each pixel includes a light emitting element and a first transistor connected to the light emitting element, and a gate electrode of the first transistor and a second electrode of the first transistor do not overlap.