Liquid Crystal Display Device Using Single Lambda/2 Film
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Solution Overview
Problem
Color-super twisted nematic (STN) mode liquid crystal display devices require multiple compensation films to enhance optical properties, increasing manufacturing costs without guaranteeing high display quality due to their passive nature and lack of thin film transistors.
Innovation Solution
A liquid crystal display device with a thin film transistor on one substrate and an electrically controlled birefringence (ECB) mode liquid crystal layer between substrates, utilizing a single λ/2 film as compensation between polarizing layers, along with anti-glare and anti-reflection coatings, to improve optical properties and reduce manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple compensation films are used in color-STN mode liquid crystal display devices, then optical properties are improved, but manufacturing costs increase
Solution Approach 1:
The patent extracts and eliminates the need for multiple compensation films by introducing a reflective region that uses the substrate's back surface as a reflector. This removes the requirement for complex compensation film stacks while maintaining optical performance, directly resolving the contradiction between optical quality and manufacturing cost.
Solution Approach 2:
Instead of using multiple compensation films to achieve the desired optical effect, the patent inverts the approach by using a reflective region that leverages the back surface of the substrate. This inverted design achieves superior optical properties with fewer components, thereby reducing manufacturing costs.
2Ease of manufacture
If color-STN mode liquid crystal display devices are used, then manufacturing costs are reduced, but display quality does not improve
Solution Approach 1:
The patent merges the transmissive and reflective regions within a single liquid crystal panel, allowing the device to achieve high display quality through the reflective region while maintaining cost-effectiveness. This combination enables the panel to deliver superior optical properties without requiring multiple separate components or complex compensation film structures.
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 provides improved display quality and reduced manufacturing costs by optimizing the liquid crystal panel's structure and optical units, achieving better transmittance, reflection, and viewing angle characteristics compared to conventional color-STN mode devices.
Implementation Method 1
a liquid crystal layer interposed between the first and second substrates and being in an electrically controlled birefringence (ECB) mode
Implementation Method 2
a compensation film interposed between the second substrate and the second polarizing layer, the compensation film having a single λ/2 film
Implementation Method 3
a first optical unit attached to an external surface of the first substrate and having a first polarizing layer, and a second optical unit attached to an external surface of the second substrate and having a second polarizing layer
Implementation Method 4
a reflective metal layer defining the reflective region
Data Source
AI summary
A liquid crystal display device includes a liquid crystal panel including a first substrate having a thin film transistor and forming a transmissive region and a reflective region thereon, a second substrate facing the first substrate and a liquid crystal layer interposed between the first and second substrates and being in an electrically controlled birefringence (ECB) mode, a first optical unit attached to an external surface of the first substrate and having a first polarizing layer, and a second optical unit attached to an external surface of the second substrate and having a second polarizing layer and a compensation film interposed between the second substrate and the second polarizing layer, the compensation film having a single λ/2 film.