Transparent Pixel Transistor Layout for High-Aperture LCDs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current liquid crystal display devices face challenges in achieving high aperture ratio, low power consumption, high resolution, narrow frame, high reliability, and cost-effective mass production with simplified manufacturing processes, particularly when using large-sized substrates.
Innovation Solution
The implementation of a display device structure that includes a liquid crystal element with a first transistor having a visible-light-transmitting region and a second transistor with a different structure, where the first transistor is connected to the pixel electrode and the channel region contains metal oxide, allowing for increased light extraction efficiency and reduced power consumption, while using metal layers for scan and signal lines to minimize light irradiation and enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a conventional transistor structure is used in the display portion, then the manufacturing process is simplified, but the aperture ratio decreases due to larger transistor area occupying the pixel
Solution Approach 1:
The patent applies different transistor structures to different portions of the display device: the display portion uses a first transistor with a specific structure optimized for small area, while the driver circuit portion uses a second transistor with a different structure. This local differentiation allows the display portion to achieve high aperture ratio while maintaining manufacturing feasibility through the driver circuit's transistor design.
2Area of moving object
If more light-transmitting materials and structures are used to increase aperture ratio, then the aperture ratio improves, but power consumption increases due to reduced light extraction efficiency
Solution Approach 1:
The patent optimizes the optical parameters of the first transistor structure, specifically making the semiconductor layer and insulating layers transparent to visible light. By controlling the thickness and material composition of these layers, the transistor achieves both high light transmission (aperture ratio) and efficient light extraction, reducing the energy required for display operation.
3Reliability
If metal layers are used for scan and signal lines to reduce light irradiation, then reliability improves, but manufacturing complexity increases
Solution Approach 1:
The patent combines the scan line and signal line into a single metal layer structure, where both lines are formed simultaneously in the same manufacturing process step. This merging approach maintains the reliability benefits of metal layers (reduced light irradiation) while simplifying manufacturing by reducing the number of separate deposition and patterning steps required.
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
This approach results in a liquid crystal display device with improved aperture ratio, reduced power consumption, high resolution, and enhanced reliability, while also enabling cost-effective manufacturing and simplified processes for large-sized substrates.
Implementation Method 1
The pixel electrode, the common electrode, and the first region have a function of transmitting visible light. Visible light passes through the first region and the liquid crystal element and is emitted to the outside of the display device.
Data Source
AI summary
A liquid crystal display device with a high aperture ratio is provided. A liquid crystal display device with low power consumption is provided.The display device includes a display portion and a driver circuit portion. The display portion includes a liquid crystal element, a first transistor, a scan line, and a signal line. The driver circuit portion includes a second transistor. The liquid crystal element includes a pixel electrode, a liquid crystal layer, and a common electrode. Each of the scan line and the signal line is electrically connected to the first transistor. The scan line and the signal line each include a metal layer. The structure of the first transistor is different from that of the second transistor. The first transistor is electrically connected to the pixel electrode. The first transistor includes a first region connected to the pixel electrode. The pixel electrode, the common electrode, and the first region have a function of transmitting visible light. Visible light passes through the first region and the liquid crystal element and is emitted to the outside of the display device.