Transparent Storage Capacitor Layout for Reflective LCD Aperture Ratio
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Solution Overview
Problem
Transmissive LCDs face issues with dim screens and severe heating in outdoor environments due to strong external light, while reflective LCDs offer advantages in bright conditions but face challenges with limited pixel aperture ratio and storage capacitor capacitance.
Innovation Solution
A display substrate design featuring transparent common signal lines in a grid-like structure, allowing for a transparent conductive portion to form a storage capacitor with the pixel electrode, enhancing capacitance and aperture ratio without obstructing light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If reflective LCD is used to achieve bright display in outdoor conditions, then display brightness is improved, but pixel aperture ratio and storage capacitor capacitance are limited
Solution Approach 1:
The patent utilizes the thickness dimension (Z-axis) by positioning the transparent conductive portion in the first transparent electrode layer and the pixel electrode in the second transparent electrode layer, creating overlap in the thickness direction to form the storage capacitor. This allows the capacitor to be formed without occupying additional planar area, thus maintaining a high aperture ratio while providing sufficient capacitance for bright outdoor display.
Solution Approach 2:
The transparent conductive portion serves multiple functions: it acts as a common signal line for electrical connection and simultaneously serves as one electrode of the storage capacitor. This multi-functionality eliminates the need for separate capacitor electrodes, maximizing the use of available space and maintaining high aperture ratio while ensuring adequate capacitance for bright display operation.
2Area of stationary object
If transparent common signal lines are used to form storage capacitor, then aperture ratio is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the common signal line structure with the storage capacitor electrode structure. The transparent conductive portion that forms the common signal line network is simultaneously used as one electrode of the storage capacitor, eliminating the need for separate capacitor electrode patterns and reducing the number of fabrication steps while maintaining high aperture ratio.
Solution Approach 2:
The transparent conductive material and its patternized structure serve dual purposes: providing electrical connections as common signal lines and forming capacitor electrodes. This multi-functional design reduces manufacturing complexity by consolidating multiple functions into a single structural element, avoiding additional patterning steps while achieving high aperture ratio.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves display brightness and color vividness in high ambient light conditions by maintaining high aperture ratio and storage capacitor performance, leveraging transparent conductive materials for enhanced light utilization.
Implementation Method 1
in an overlapping region of the pixel electrode and the transparent conductive portion, the pixel electrode and the transparent conductive portion form a storage capacitor of the sub-pixel
Data Source
AI summary
A display substrate, a display panel and a display device. The display substrate includes: a first base substrate; a first transparent electrode layer on the first base substrate; a second transparent electrode layer on a side of the first transparent electrode layer away from the first base substrate; first common signal lines and second common signal lines in the first transparent electrode layer, the first common signal lines being electrically connected through the second common signal lines; and a sub-pixel on the first base substrate, including a pixel electrode in the second transparent electrode layer. The first common signal lines and the second common signal lines form a transparent conductive portion. In a thickness direction of the display substrate, the pixel electrode overlaps with the transparent conductive portion to form an overlapping region, in which the pixel electrode and the transparent conductive portion form a storage capacitor of the sub-pixel.