Liquid Crystal Display Light Blocking Member Thickness Control
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Solution Overview
Problem
In vertically aligned liquid crystal displays, the formation of a thick light blocking member on color filters leads to decreased transmittance and difficulties in expressing gradations, particularly on lateral surfaces, resulting in deteriorated image quality.
Innovation Solution
A liquid crystal display design that includes a shielding electrode on the capping layer with an insulating layer having openings, allowing the light blocking member to be thinner where color filters overlap, and spacers of equal thickness to maintain panel distance, preventing the light blocking member from contacting the second display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light blocking member is formed on color filters to prevent light leakage, then light blocking performance is improved, but the light blocking member becomes thick where color filters overlap, causing decreased transmittance and deteriorated image quality
Solution Approach 1:
The patent applies local quality by making the light blocking member have different thicknesses at different locations. Specifically, the light blocking member is formed to be thinner in regions where color filters overlap compared to regions where they do not overlap. This is achieved by controlling the deposition process to create a thickness profile that adapts to the local structure, preventing excessive thickness buildup at overlap regions while maintaining adequate light blocking where needed.
Solution Approach 2:
The patent introduces a dimensional approach by forming the light blocking member with a thickness gradient rather than uniform thickness. The thickness varies continuously or in steps across the surface, creating a three-dimensional profile that responds to the two-dimensional pattern of color filter overlaps. This dimensional variation allows the structure to maintain light blocking functionality while avoiding excessive thickness at critical overlap regions.
2Ease of operation
If one pixel is divided into two subpixels with different voltage application to improve lateral visibility, then lateral visibility is improved, but luminance increases in low and high gradations making it difficult to express gradation on lateral surface
Solution Approach 1:
The patent applies parameter changes by adjusting the voltage parameters applied to different subpixels. Specifically, different voltage levels are applied to different subpixels within a pixel, and the voltage waveform parameters are optimized to control the liquid crystal molecule orientation. This parameter optimization ensures that while lateral visibility is improved through differential voltage application, the gradation expression is maintained by preventing luminance saturation in extreme gradation regions.
3Ease of operation
If one pixel is divided into two subpixels to improve lateral visibility, then lateral visibility is improved, but transmittance is decreased by the gap between two subpixels
Solution Approach 1:
The patent applies color changes by utilizing the color filter properties of different subpixels. Each subpixel is equipped with color filters that allow specific wavelength ranges to pass through. By coordinating the voltage application with the color filter characteristics, the patent optimizes which colors are transmitted through each subpixel, thereby improving lateral visibility while minimizing the overall transmittance loss that would result from the presence of subpixel gaps and color filtering.
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 design reduces the thickness of the light blocking member where color filters overlap, preventing contact with the second display panel and allowing for improved gradation expression by controlling transmittance changes, thus enhancing image quality and maintaining lateral visibility similar to front visibility.
Implementation Method 1
An amount of transmitted light is controlled by determining an alignment of liquid crystal molecules of the liquid crystal layer through application of voltage to the field generating electrodes to display an image
Implementation Method 2
The shielding electrode is disposed on the capping layer... The shielding electrode is disposed in a part corresponding to the data line
Implementation Method 3
A first spacer and a second spacer that are disposed on the light blocking member and have the same thickness. A distance between the first substrate and the top surface of the first spacer may be larger than a distance between the first substrate and the top surface of the second spacer
Data Source
AI summary
Disclosed is a liquid crystal display including: a first substrate; a gate line disposed on the first substrate; a data line disposed on the gate line; and a thin film transistor connected to the gate line and the data line. A plurality of color filters is disposed on the thin film transistor and the data line. A capping layer is disposed on the plurality of color filters. A shielding electrode is disposed on the capping layer. An insulating layer is disposed on the capping layer and includes a first opening extending to a part of the shielding electrode. A light blocking member is disposed on the insulating layer and the shielding electrode. The shielding electrode is disposed in a part corresponding to the data line. Adjacent color filters among the plurality of color filters overlap with each other in the part corresponding to the data line. The first opening is disposed in a part corresponding to the region where the adjacent color filters overlap with each other.