Liquid Crystal Panel Fine Slit Arrangement for Luminance Uniformity
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Solution Overview
Problem
Liquid crystal display devices experience luminance unevenness due to variations in the line width of fine slits in pixel electrodes, leading to transmittance issues.
Innovation Solution
A liquid crystal panel configuration with specific alignment domains and fine slit arrangements, where fine slits are strategically placed in certain regions of pixel electrodes, and not in others, to maintain consistent luminance across the panel, using photolithography for precise slit formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fine slits are formed in pixel electrodes to improve alignment control, then liquid crystal alignment is improved, but line width variation causes luminance unevenness
Solution Approach 1:
The patent applies local quality by making fine slits selective rather than uniform across all pixel electrodes. Specifically, fine slits are provided in some pixel electrodes (first pixel electrodes) but not in others (second pixel electrodes), creating local differentiation. This selective application allows alignment control where needed while avoiding luminance unevenness in regions where slits would cause problems, thus resolving the contradiction between alignment improvement and manufacturing precision.
2Stability of the object's composition
If fine slits are provided in all pixel electrodes to enhance alignment, then alignment control is improved, but luminance unevenness increases due to line width variation
Solution Approach 1:
The patent implements local quality by differentiating between first pixel electrodes that receive fine slits for alignment control and second pixel electrodes that remain without fine slits to maintain uniform luminance. This localized application of fine slits ensures alignment control is achieved in specific regions while avoiding luminance unevenness in other regions, effectively resolving the contradiction between alignment control and luminance uniformity.
3Manufacturing precision
If photolithography is used to form fine slits with high precision, then line width control is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies partial action by forming fine slits in only some pixel electrodes rather than all pixel electrodes. This selective formation reduces the overall manufacturing complexity compared to forming slits uniformly across the entire panel, while still achieving the necessary alignment control in critical regions. The photolithography process is applied partially rather than universally, balancing precision requirements with manufacturing simplicity.
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
The solution effectively suppresses luminance unevenness by ensuring consistent transmittance across the panel, improving display quality and reducing seam-shaped display defects.
Implementation Method 1
the first alignment film and the second alignment film having been subjected to an alignment treatment each include a first domain in which a direction of the alignment vector is a first direction
Implementation Method 2
the method including forming the fine slits by photolithography, the photolithography including irradiating a photosensitive resin formed on a conductive film with light through a mask in which a pattern corresponding to the fine slits is formed
Data Source
AI summary
A liquid crystal panel includes a first substrate including multiple pixel electrodes; a liquid crystal layer; and a second substrate including a common electrode. In at least 30 pixels consecutive in a row direction, arrays of the domains are identical, the domains in the display unit region located in an nth row are arranged in an order of a first domain, a second domain, a third domain, and a fourth domain, and each of the pixel electrodes includes a first pixel electrode having a configuration in which fine slits parallel to an alignment vector of the corresponding domain are provided in at least one of a region superimposed on the first domain, a region superimposed on the second domain, a region superimposed on the third domain, or a region superimposed on the fourth domain while the fine slits are not provided in the remaining regions.