Liquid Crystal Display Light Leakage Prevention
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Solution Overview
Problem
Liquid crystal displays (LCDs) face issues with light leakage from the channel layer and design limitations due to alignment errors and overlapping steps during the formation of color filters, which affect the contrast ratio and viewing angle.
Innovation Solution
The implementation of a liquid crystal display design featuring a first substrate with overlapping color filters and a light leakage preventing layer made of the same material as the gate electrodes, positioned between the color filters to prevent light leakage and overcome design limitations by forming openings and using a blue color filter with low transmittance to effectively block light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light blocking member is formed at the position where the thin film transistor is formed, then light leakage of the channel layer is prevented, but when the optical density of the light blocking member is low, light leakage may be partially generated
Solution Approach 1:
The patent uses a composite structure combining a light blocking member (first color filter) with a light leakage preventing layer (second color filter) to achieve effective light blocking. The first color filter has low optical density and is positioned at the thin film transistor location, while the second color filter with different optical properties is positioned at the data line location, creating a composite light blocking system that overcomes the limitation of single-material light blocking members.
2Object-affected harmful factors
If the color filter is formed in the thin film transistor array panel like the light blocking member, then light leakage is prevented, but a design limitation for the formation position of the contact hole occurs due to the step generated from the overlap of the color filters
Solution Approach 1:
The patent divides the light blocking function into two separate color filters (first color filter and second color filter) positioned at different locations. The first color filter is positioned at the thin film transistor location while the second color filter is positioned at the data line location, allowing contact holes to be formed without encountering alignment steps from overlapping color filters, thus eliminating the design limitation while maintaining light blocking effectiveness.
3Adaptability or versatility
If multiple domains are formed in one pixel by creating cutouts or protrusions in the field generating electrode, then wide viewing angle is achieved, but the structure becomes more complex
Solution Approach 1:
The patent applies local quality by positioning the first color filter specifically at the thin film transistor location and the second color filter at the data line location, rather than uniformly distributing light blocking structures across the entire electrode. This localized approach achieves both light blocking and domain formation functions without requiring complex cutouts or protrusions throughout the electrode structure.
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 effectively prevents light leakage and eliminates design limitations, enhancing the contrast ratio and viewing angle of the liquid crystal display by using a blue color filter and a light leakage preventing layer to manage light blocking and alignment errors.
Implementation Method 1
using a blue color filter with low transmittance to effectively block light
Implementation Method 2
a light leakage preventing layer made of the same material as the gate electrodes, positioned between the color filters to prevent light leakage
Implementation Method 3
A voltage is applied between the field generating electrodes to generate an electric field on the liquid crystal layer, and the orientation of liquid crystal molecules of the liquid crystal layer is determined and the polarization of incident light is controlled through the generated electric field
Data Source
AI summary
A liquid crystal display according to an exemplary embodiment of the present inventive concept includes a first substrate including a plurality of first color filters, a plurality of second color filters, a plurality of third color filters and a plurality of gate electrodes extending in a first direction;a second substrate facing the first substrate; and a liquid crystal layer formed between the first substrate and the second substrate, wherein the plurality of first color filters include a plurality of first portions extending in a first direction, and a plurality of second portions extending in a second direction substantially perpendicular to the first direction and crossing the plurality of first portions.