Transparent Capacitor Electrode Merging for LCD Aperture Ratio
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Solution Overview
Problem
Increasing the number of pixels per unit area in liquid crystal display devices decreases the aperture ratio and increases power consumption, making it difficult to design high-resolution and low-power liquid crystal display devices with improved manufacturing yield.
Innovation Solution
The design includes a liquid crystal display device with a capacitor that transmits visible light, featuring overlapping conductive layers that function as both capacitors and electrodes, allowing for increased aperture ratio and reduced power consumption by optimizing the structure of the transistor and capacitor layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels per unit area is increased, then the resolution is improved, but the aperture ratio is decreased
Solution Approach 1:
The patent combines the capacitor electrode and the liquid crystal electrode into a single conductive layer structure. The capacitor electrode is formed as a transparent conductive layer that also serves as the liquid crystal electrode, eliminating the need for separate capacitor electrodes and insulating layers. This merging of functions allows the aperture ratio to be increased while maintaining the required number of pixels for high resolution.
Solution Approach 2:
The transparent conductive layer performs multiple functions simultaneously: it acts as the capacitor electrode for charge storage, the liquid crystal electrode for electric field generation, and the transparent electrode for light transmission. This multi-functionality reduces the number of separate components needed in each pixel, thereby increasing the aperture ratio while supporting high pixel density.
2Measurement precision
If the number of pixels per unit area is increased, then the resolution is improved, but the power consumption is increased
Solution Approach 1:
By merging the capacitor and liquid crystal electrode functions into a single transparent conductive layer, the patent eliminates redundant components and reduces the overall power consumption. The integrated structure requires less energy to operate while maintaining high resolution through increased pixel density.
3Measurement precision
If the pixel area is significantly decreased, then the resolution is improved, but the manufacturing yield is decreased
Solution Approach 1:
The patent simplifies the pixel structure by merging the capacitor and liquid crystal electrode into a single transparent conductive layer. This reduced structural complexity makes the manufacturing process more robust and less prone to defects, thereby improving manufacturing yield even when pixel dimensions are significantly reduced for high resolution.
Solution Approach 2:
The multi-functional transparent conductive layer reduces the number of fabrication steps and alignment requirements compared to separate capacitor and liquid crystal electrodes. This simplification improves manufacturing yield by reducing process complexity while enabling smaller pixel sizes for high resolution displays.
Data Source
AI summary
A liquid crystal display device with high aperture ratio is provided. The liquid crystal display device includes a first conductive layer, a second conductive layer, and a liquid crystal element where a liquid crystal layer is positioned between a third conductive layer and a fourth conductive layer. The first to fourth conductive layers transmit visible light and include a region where the first to fourth conductive layers overlap with each other. The second conductive layer is positioned between the first conductive layer and the third conductive layer. An insulating layer is positioned between the first conductive layer and the second conductive layer. An insulating layer is positioned between the second conductive layer and the third conductive layer. Therefore, two capacitors each including the second conductive layer as an electrode are stacked. The two capacitors transmit light and overlap with the liquid crystal element; thus, aperture ratio can be increased.