VA LCD Brightness Uniformity via Organic Layer Height Difference
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Solution Overview
Problem
Vertically aligned (VA) mode liquid-crystal display devices exhibit poor image quality when viewed from the sides due to significant differences in brightness compared to viewing from the front, leading to deteriorated visibility.
Innovation Solution
The implementation of a liquid-crystal display device with a substrate having pixels that include an active area with a specific organic layer structure, where the organic layer is only disposed in a first area and creates a height difference with connected second and third areas, allowing for controlled light transmittance and improved visibility by varying the electric field intensity across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional VA-mode liquid-crystal display device is used, then the image quality when viewed from the front is good, but the brightness difference between front and side views is large causing poor visibility from the sides
Solution Approach 1:
The organic layer is selectively disposed only in the first area of the active area, creating different heights in different regions. This local structural variation causes different electric field intensities in different areas, which controls liquid crystal molecule orientation differently across the pixel, thereby improving brightness uniformity between front and side views
Solution Approach 2:
The invention introduces a height dimension variation within the pixel structure by creating a first area with an organic layer at a different height than the second and third areas. This vertical dimension change enables control over light transmission characteristics from different viewing angles, addressing the brightness uniformity issue
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 configuration reduces the brightness difference between front and side views, enhancing the visibility and transmittance of the liquid-crystal display device, particularly by creating a level difference in the organic layer to control liquid-crystal molecule orientation and electric field intensity.
Implementation Method 1
Voltage is applied to the electric field generating electrodes to form an electric field in the liquid-crystal layer, such that the orientation of the liquid crystals contained in the liquid-crystal layer is aligned
Implementation Method 2
the polarization of incident light is controlled, to display images
Data Source
AI summary
A liquid-crystal display device includes: a substrate on which a plurality of pixels is defined, wherein each of the pixels includes an active area where transmittance of light is controlled; an organic layer disposed on the substrate; and a pixel electrode disposed on the organic layer. The active area comprises a first area, a second area and a third area, the second and third areas are connected to the first area on both sides thereof, respectively, when viewed from a top, and the organic layer is disposed only in the first area.