Dual-Prism LCD Luminance Boost via Orthogonal Light Condensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display (LCD) apparatuses struggle to condense light from all directions and minimize light extinction due to total reflection, resulting in reduced luminance.
Innovation Solution
The implementation of a liquid crystal display apparatus with a backlight unit, a first luminance increasing film with a prism part along the X-axis, and a second luminance increasing film with a higher refractivity along the Y-axis, along with polarization films and an anti-reflection part, to effectively condense and control light in all directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional single-prism-pattern sheet is used, then the structure is simple, but light condensation in perpendicular directions is insufficient
Solution Approach 1:
The single prism sheet is divided into two separate prism sheets, each with a different prism pattern orientation. The first prism sheet has prisms extending in the first direction, while the second prism sheet has prisms extending in the second direction perpendicular to the first direction. This segmentation allows each sheet to condense light in its specific direction, achieving comprehensive light condensation in both directions without requiring a single complex structure.
Solution Approach 2:
The invention transitions from a single-dimensional prism pattern (one direction) to a two-dimensional prism pattern system (two perpendicular directions). By stacking two prism sheets with orthogonal orientations, the system achieves light condensation in multiple dimensions, effectively addressing light from all directions incident on the display apparatus.
2Illumination intensity
If light condensation is increased, then luminance improves, but light extinction due to total reflection increases
Solution Approach 1:
The invention changes the refractive index parameter by using an optical adhesive layer with a refractive index higher than both the first and second prism sheets. This parameter change reduces the refractive index difference at the interfaces, minimizing total internal reflection and light extinction while maintaining effective light condensation. The higher refractive index adhesive layer acts as an optical intermediary that facilitates light transmission between the prism sheets and the liquid crystal panel.
3Illumination intensity
If a diffusion sheet is added to diffuse light, then light distribution improves, but light condensation efficiency decreases
Solution Approach 1:
The invention extracts and removes the diffusion sheet from the optical path between the light guide plate and the liquid crystal panel. By eliminating this diffusion component, the system maintains direct light transmission paths, allowing the prism sheets to effectively condense light without the light being scattered in multiple directions by diffusion. This extraction of the diffusion function enables the prism sheets to perform their light condensation function more efficiently.
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 significantly increases luminance by condensing light from all directions and minimizing light extinction, resulting in a luminance boost of about 110% indoors and 163% outdoors compared to conventional systems.
Implementation Method 1
a first luminance increasing film interposed between the backlight unit and the liquid crystal panel, and increasing luminance using a first prism part formed along an X-axis direction
Implementation Method 2
a second luminance increasing film interposed between the backlight unit and the first luminance increasing film, increasing luminance using a second prism part formed along a Y-axis direction, and having a refractivity greater than the first luminance increasing film
Implementation Method 3
first and second polarization films disposed between the liquid crystal panel and the first luminance increasing film and on the liquid crystal panel, respectively
Data Source
AI summary
A liquid crystal display apparatus includes a backlight unit, a liquid crystal panel, a first luminance increasing film, and a second luminance increasing film. The backlight unit upwardly emits light. The liquid crystal panel is disposed on the backlight unit to receive the light, and displays an image using characteristics of liquid crystal. The first luminance increasing film is interposed between the backlight unit and the liquid crystal panel, and increases luminance using a first prism part formed along an X-axis direction. The second luminance increasing film is interposed between the backlight unit and the first luminance increasing film, increases luminance using a second prism part formed along a Y-axis direction, and has a refractivity greater than the first luminance increasing film.