Resin Substrate LCD with Stress-Aligned Polarizers
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Solution Overview
Problem
Existing liquid crystal display devices using resin films as substrates experience light leakage due to internal mechanical stress, which is not effectively addressed by current technologies.
Innovation Solution
The liquid crystal display device incorporates a resin film-based substrate with strategically positioned insulating films and polarizing plates, where the contact holes have through-holes and varying film thicknesses to manage stress, aligning the polarizing plates' absorption axes with the direction of normal stress, thereby reducing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a resin film is used as a substrate of a liquid crystal panel, then flexibility and light weight are improved, but internal stress occurs in the liquid crystal panel causing light leakage
Solution Approach 1:
The patent applies local quality by creating regions with different numbers of insulating films (first region with fewer films, second region with more films) to generate localized stress compensation zones. This non-uniform structure allows specific areas to counteract the internal stress caused by the resin film substrate, thereby suppressing light leakage while maintaining the overall flexibility and light weight benefits of the resin film substrate.
2Stability of the object's composition
If the number of insulating films is varied in different regions, then stress distribution is improved, but device complexity increases
Solution Approach 1:
The patent segments the insulating film layer into multiple discrete layers (first insulating film, second insulating film, third insulating film, etc.) that can be selectively removed or retained in different regions. This segmentation allows independent control of film thickness in the first and second regions, enabling stress distribution optimization through a relatively simple manufacturing process that involves standard thin film deposition and selective etching techniques.
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 effectively suppresses light leakage in black displays by matching the polarizing axes with stress directions, improving display quality and reducing photoelastic effects in resin film substrates.
Implementation Method 1
an incident-side linear polarizing plate arranged on a light-incident side of the liquid crystal layer, and an emission-side linear polarizing plate arranged on a light-emission side of the liquid crystal layer
Implementation Method 2
light leakage occurs at a normally-black liquid crystal panel due to stress occurring at each glass substrate of the liquid crystal panel
Data Source
AI summary
A liquid crystal display device according to an aspect of the disclosure includes a liquid crystal panel including an element substrate, a counter substrate facing the element substrate, a liquid crystal layer sandwiched between the element substrate and the counter substrate, an incident-side linear polarizing plate arranged on a light-incident side of the liquid crystal layer, and an emission-side linear polarizing plate arranged on a light-emission side of the liquid crystal layer. Each of the element substrate and the counter substrate uses a resin film as base material. A plurality of insulating films are formed on the base material. A contact hole is formed in the plurality of insulating films, the contact hole being rectangular in plan view. Either a long side or a short side of the contact hole is parallel with an absorption axis of the incident-side linear polarizing plate or the emission-side linear polarizing plate.