Necked-Down Transistor Black Matrix Aperture Ratio
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Solution Overview
Problem
As liquid crystal displays (LCDs) miniaturize, the increasing ratio of the black matrix to the unit pixel area decreases the aperture ratio, affecting image quality and contrast due to light exposure and color mixture issues.
Innovation Solution
The design includes a semiconductor layer with a necked-down portion in transistors, where the black matrix is optimized to shield only the necked-down portion, reducing its width and minimizing light exposure, thereby reducing the black matrix's width and enhancing the pixel aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the unit pixel area is shrunk to improve image quality, then the image quality improves, but the ratio of the black matrix to the unit pixel area increases, which substantially decreases the aperture ratio of the pixel
Solution Approach 1:
The semiconductor layer is designed with a necked-down portion that has a different width than the end portions, creating local variation in the structure. This allows the black matrix to be positioned only where needed (over the necked-down portion) rather than covering the entire semiconductor layer, thereby reducing the black matrix width while maintaining shielding effectiveness.
Solution Approach 2:
The semiconductor layer is segmented into distinct portions with different widths - the necked-down portion between the source and drain electrodes, and the wider end portions. This segmentation enables selective placement of the black matrix over only the critical necked-down region, optimizing the balance between shielding and aperture ratio.
2Area of stationary object
If the black matrix width is reduced to increase aperture ratio, then the aperture ratio increases, but light shielding effectiveness may be compromised
Solution Approach 1:
The necked-down portion of the semiconductor layer, which is a necessary structural feature for transistor operation, is strategically positioned and shaped to serve a dual purpose: it maintains electrical functionality while providing an optimized geometry that allows the black matrix to achieve effective light shielding with minimal width, thus converting a potential waste of aperture area into a beneficial shielding structure.
Data Source
AI summary
A display is provided which includes: a first substrate; gate lines and data lines; transistors respectively located in pixel areas, wherein each of the transistors includes: an active layer on the first substrate and having a first end portion, a second end portion, and a necked-down portion connecting the first and the second end portions; a second substrate on the first substrate; and a display medium between the first substrate and the second substrate.