Electro-optical Device Shift Circuit for Miniaturization
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Solution Overview
Problem
The miniaturization of electro-optical devices is hindered by the need for increased capacitance values in coupling capacitors to achieve a black display state, which requires significant space and complicates high-quality display with fine gradation variations.
Innovation Solution
An electro-optical device with a shift circuit that adjusts the potential of the data line using a coupling capacitor with electrodes connected to both the output and data lines, allowing for potential shifting without increasing capacitance, enabling miniaturization and improved display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacitance value of the coupling capacitor is increased to achieve a black display state, then the black display quality is improved, but the device area increases making miniaturization difficult
Solution Approach 1:
The patent introduces a shift circuit that dynamically adjusts the potential of the data line before or after data signal output. This dynamic potential adjustment replaces the static solution of increasing capacitor capacitance, allowing the system to achieve black display state without requiring larger capacitor area. The shift circuit modifies the voltage level adaptively based on display requirements.
Solution Approach 2:
The patent changes the potential parameter of the data line through the shift circuit instead of changing the capacitance parameter of the coupling capacitor. By adjusting the potential of the data line to a shifted level, the system achieves the same black display effect without increasing capacitor size, thus resolving the contradiction between display quality and device area.
2Manufacturing precision
If the capacitance value of the coupling capacitor is increased to control gate node potential with high accuracy, then the display quality with fine gradation variations is improved, but the device area increases
Solution Approach 1:
The shift circuit provides dynamic potential adjustment of the data line, enabling precise control of the gate node potential through voltage level shifting rather than relying on large capacitor values. This dynamic control mechanism achieves fine gradation variations without increasing the coupling capacitor area.
Solution Approach 2:
The shift circuit acts as an intermediary between the data signal source and the pixel circuit, adjusting the data line potential to achieve precise gate node control. This intermediary circuit enables accurate potential control without requiring the coupling capacitor to have large capacitance value, thus maintaining small device area.
Data Source
AI summary
An electro-optical device includes a scanning line, a data line, a pixel circuit provided corresponding to an intersection between the scanning line and the data line and including an OLED, a DA conversion circuit that outputs, to a data signal output line, a data signal at a potential corresponding to the brightness of the OLED, a capacitance element having one end coupled to the data signal output line and the other end coupled to the data line, a capacitance element having one end coupled to the data line, and a NOT circuit that shifts a potential of the other end of the capacitance element before the data signal is output or after the data signal is output.