Liquid Crystal Display Light Guide Elimination
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Solution Overview
Problem
Transmissive liquid crystal display devices face issues with reduced or non-uniform luminance due to light absorption in resin-based lightguide plates, which can change shape and alter light color, and require multiple polarizers, leading to light loss and display quality degradation.
Innovation Solution
A liquid crystal display device design that eliminates the resin lightguide plate, using a phototransmissive glass substrate with a light source emitting polarized parallel light, a prism film, and a single polarizer, reducing light absorption and maintaining polarization, thereby enhancing display quality and reducing light loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a resin lightguide plate is used to guide light from the light source, then the device structure is simplified, but light absorption occurs causing reduced and non-uniform luminance
Solution Approach 1:
The patent removes the resin lightguide plate from the device structure and replaces it with a reflection-type liquid crystal shutter. This extraction eliminates the light absorption problem caused by the resin material while maintaining the light guiding function through the reflective liquid crystal shutter mechanism positioned between the light source and the liquid crystal panel.
Solution Approach 2:
The patent changes the material parameter from resin to phototransmissive glass for the substrate, and changes the light guiding mechanism from direct resin transmission to reflection-type liquid crystal shutter. This parameter change resolves the light absorption issue by using materials and mechanisms with superior light transmission and reflective properties.
2Illumination intensity
If a resin lightguide plate is used, then light guiding is achieved, but the shape changes due to heat, load, and moisture causing non-uniform luminance
Solution Approach 1:
The patent extracts the resin lightguide plate that causes shape instability and replaces it with a reflection-type liquid crystal shutter. This removal eliminates the problems of shape change due to heat, load, and moisture, as the new mechanism uses phototransmissive glass and liquid crystal materials that maintain dimensional stability under various environmental conditions.
Solution Approach 2:
The patent employs composite materials including phototransmissive glass substrate and liquid crystal materials in the reflection-type shutter. These materials provide superior stability against heat, load, and moisture compared to resin, ensuring uniform luminance output without shape deformation.
3Ease of operation
If multiple polarizers are used in the light path, then polarization control is improved, but light loss increases reducing display brightness
Solution Approach 1:
The patent removes unnecessary polarizers from the light path while maintaining effective polarization control through the reflection-type liquid crystal shutter. By extracting redundant polarizing elements, the system reduces light loss and improves display brightness while retaining the necessary polarization functionality through the liquid crystal shutter mechanism.
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 improves display quality by maintaining consistent luminance and color, reducing light loss, and allowing for a thinner device structure by minimizing the number of polarizers.
Implementation Method 1
a light source, which emits polarized parallel light
Implementation Method 2
The bending member bends a path of the parallel light entering the first substrate from the light source such that the parallel light goes to the second substrate
Implementation Method 3
The liquid crystal layer is provided between the first substrate and the second substrate
Data Source
AI summary
In one embodiment, a display device includes first and second substrates, a liquid crystal layer, a polarizing element, a light source, and a bending member. The first substrate includes first and second surfaces and a side surface. The second substrate includes third and fourth surfaces. The polarizing element is provided on the fourth surface side of the second substrate. The light source irradiates the side surface with polarized parallel light. The bending member bends a path of the light entering the first substrate from the light source such that the light goes to the second substrate. No polarizing element is provided between the first substrate and the light source, and the bending member is provided on the second surface side of the first substrate.