Hardened Liquid Crystal Layer for LCD Array Substrate
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Solution Overview
Problem
The existing liquid crystal display (LCD) technology faces challenges in achieving wide viewing angle and high brightness due to the complexity and thickness associated with the formation of high-brightness films, which require multiple layers and increase the risk of damage during fabrication, leading to reduced contrast ratio and transmittance.
Innovation Solution
The proposed solution involves an array substrate for LCDs with a hardened liquid crystal layer and a planarization layer, where the hardened liquid crystal layer is formed in the pixel region without overlapping the second insulating layer, and a pixel electrode is connected to the drain electrode through a contact hole, enhancing the aperture ratio and reducing step differences, thus improving transmittance and contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple layers of high-brightness film are stacked to achieve wide viewing angle and high brightness, then the brightness and viewing angle are improved, but the device thickness increases and the fabrication complexity increases
Solution Approach 1:
The patent merges the functions of multiple high-brightness films into a single hardened liquid crystal layer. This layer simultaneously provides wide viewing angle, high brightness, and compensation for liquid crystal leakage, eliminating the need for stacking multiple separate films and thereby reducing overall device thickness.
Solution Approach 2:
The hardened liquid crystal layer serves multiple functions: it acts as a high-brightness film, a wide viewing angle film, and a compensation film for liquid crystal leakage. This multi-functional design replaces what would traditionally require multiple separate layers, thus reducing device thickness while maintaining all necessary optical performances.
2Illumination intensity
If multiple layers of high-brightness film are stacked to achieve wide viewing angle and high brightness, then the brightness and viewing angle are improved, but the fabrication process becomes more complex and the risk of film damage increases
Solution Approach 1:
The patent combines multiple film functions into a single hardened liquid crystal layer, reducing the number of fabrication steps. Instead of sequentially stacking and aligning multiple high-brightness films, the process involves forming one integrated layer, thereby simplifying fabrication and reducing the risk of damage during assembly.
Solution Approach 2:
The liquid crystal layer is hardened in advance during the fabrication process, creating a stable, integrated structure before final assembly. This preliminary hardening action ensures the layer maintains its structural integrity and optical properties without requiring subsequent handling of multiple separate films, thus simplifying the overall fabrication process.
3Illumination intensity
If multiple layers of high-brightness film are stacked to achieve wide viewing angle and high brightness, then the brightness and viewing angle are improved, but the transmittance and contrast ratio decrease
Solution Approach 1:
The patent merges multiple optical functions into a single hardened liquid crystal layer that maintains high light transmittance. By eliminating the interfaces and additional materials associated with stacking multiple films, the design reduces light loss and maintains high contrast ratio while achieving wide viewing angle and high brightness.
Solution Approach 2:
The hardened liquid crystal layer functions as a composite material structure that integrates the optical properties of multiple films. This composite approach achieves the cumulative optical effects of wide viewing angle and high brightness while maintaining the transmittance characteristics of a single integrated layer, avoiding the light loss associated with multiple interfaces.
4Illumination intensity
If multiple layers of high-brightness film are stacked to achieve wide viewing angle and high brightness, then the brightness and viewing angle are improved, but the aperture ratio is reduced
Solution Approach 1:
The patent combines multiple film functions into a single hardened liquid crystal layer that can be integrated within the pixel region without requiring additional space. This integration maintains a high aperture ratio by eliminating the extra thickness and lateral extensions that would be required for stacking multiple separate films.
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 compact, high-aperture-ratio LCD with improved transmittance and contrast ratio by eliminating step differences and allowing for a slim profile, while simplifying the fabrication process and reducing the risk of damage.
Implementation Method 1
a hardened liquid crystal layer in the pixel region
Data Source
AI summary
An array substrate of an LCD and a fabricating method thereof are provided. A first insulating layer is formed on the substrate. A TFT and a hardened liquid crystal layer are provided in a pixel region of the substrate. A second insulating layer is formed in the pixel region around the hardened liquid crystal layer such that the second insulating layer and the hardened liquid crystal layer are substantially planar. A first alignment layer is formed between the hardened liquid crystal layer and the first insulating layer. A pixel electrode is formed on the second insulating layer and the hardened liquid crystal layer and contacts a drain region of the TFT through a hole in the first insulating layer. A second alignment layer is formed on the entire substrate over the second insulating layer and the hardened liquid crystal layer.