Prism Plate Angular Orientation for LCD Brightness Homogeneity
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Solution Overview
Problem
Large-sized liquid crystal displays require the use of an upper diffusion plate to ensure homogeneous brightness, which compromises luminance gain, increasing manufacturing costs and affecting optical quality.
Innovation Solution
A liquid crystal display device design that omits the topmost diffusion plate and positions the first prism plate directly against the liquid crystal panel at an angle of 50°-90°, with a hazed lower surface and a second prism plate between the first prism plate and diffusion plate, to enhance light transmittance and reduce manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an upper diffusion plate is used to ensure homogeneous brightness, then brightness homogeneity is improved, but luminance gain deteriorates
Solution Approach 1:
The invention extracts and removes the upper diffusion plate from the conventional optic film assembly. By taking out this specific component that causes luminance loss, the patent achieves both higher luminance gain (up to 10% improvement) and adequate brightness homogeneity through the alternative arrangement of the first prism plate directly confronting the liquid crystal panel at a 50°-90° angle.
2Manufacturing precision
If an upper diffusion plate is used to eliminate side lobe light shape, then optical grade is improved, but manufacturing cost increases
Solution Approach 1:
The invention extracts and eliminates the upper diffusion plate from the optic film assembly, reducing the number of components from three (lower diffusion plate, prism plate, upper diffusion plate) to two (lower diffusion plate, first prism plate). This simplification lowers manufacturing costs while maintaining adequate optical grade through the optimized prism plate configuration.
Solution Approach 2:
The invention changes the orientation parameter of the first prism plate, positioning it at a 50°-90° angle relative to the liquid crystal panel instead of the conventional parallel arrangement. This parameter change enables the prism plate to perform both the light redistribution function of the removed upper diffusion plate and maintain proper optical characteristics.
3Manufacturing precision
If an upper diffusion plate is used to achieve homogeneous emission, then brightness homogeneity is improved, but light utilization decreases
Solution Approach 1:
The invention removes the upper diffusion plate that causes light scattering and energy loss. By extracting this component, the patent improves light utilization efficiency while maintaining brightness homogeneity through the first prism plate's optimized angular configuration.
Solution Approach 2:
The invention changes the spatial orientation of the first prism plate to a 50°-90° angle, which optimizes light transmission paths and reduces unnecessary scattering. This parameter optimization improves light utilization while achieving homogeneous emission without requiring the upper diffusion plate.
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 improves light utilization, reduces non-homogeneity of brightness and darkness, and enhances the optical grade of large-sized liquid crystal displays while lowering manufacturing costs by increasing light transmittance and achieving better brightness homogeneity.
Implementation Method 1
The first prism plate comprises a first base plate and a plurality of parallel first prism bars formed on an upper surface of the first base plate. The first prism bars have an axial direction that forms an included angle with respect to a polarization direction of the first polarization plate.
Implementation Method 2
The first base plate of the first prism plate has a lower surface that is subjected to hazing treatment to form a hazed surface.
Implementation Method 3
The liquid crystal panel comprises a first polarization plate. The first polarization plate is arranged to directly confront the first prism plate.
Data Source
AI summary
The present invention provides a liquid crystal display device, which includes a backlight module and a liquid crystal panel disposed on the backlight module. The backlight module includes an optic film assembly. The optic film assembly includes a first prism plate. The liquid crystal panel includes a first polarization plate. The first polarization plate is arranged to directly confront the first prism plate. The first prism plate includes a first base plate and a plurality of parallel first prism bars formed on an upper surface of the first base plate. The first prism bars have an axial direction that forms an included angle with respect to a polarization direction of the first polarization plate. The liquid crystal display device omits the topmost diffusion plate that is conventionally used in the known the optic film assembly so as to reduce the manufacture cost.