Double-Vision Backlight Module Prism Light Splitting
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Solution Overview
Problem
Autostereoscopic 3D double-vision displays suffer from a central-interference area where both left and right images are visible, leading to high brightness and degraded display effects.
Innovation Solution
A double-vision backlight module is designed with prism sheets arranged between a diffuser plate and an LCD panel, where the prism sheets converge and split light to enhance brightness in the left and right view areas while reducing brightness in the central-interference area, using a non-parallel or parallel backlight source with specific prism angles and configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the central-interference area is reduced by modifying the double-vision display panel, then the display effect is improved, but the central-interference area cannot be eliminated completely and still has high brightness
Solution Approach 1:
The patent introduces a light-splitting prism sheet that segments the light paths from the backlight source, directing left FOV light to the left view area and right FOV light to the right view area. This segmentation prevents mixed light from reaching the central-interference area, effectively eliminating the harmful brightness there while maintaining image brightness in the designated view areas.
Solution Approach 2:
The light-splitting prism sheet acts as an intermediary optical element between the backlight source and the display panel. It mediates the light distribution by splitting and directing light to specific view areas, thereby controlling which areas receive bright light and which areas remain dark, specifically eliminating brightness in the central-interference zone.
2Illumination intensity
If prism sheets are arranged with prisms facing the LCD panel, then light is split and brightness is enhanced in left and right view areas, but the complexity of the backlight module increases
Solution Approach 1:
The patent optimizes the prism sheet parameters, specifically setting the prism base angle to be smaller than arcsin(1/n) where n is the refractive index. This parameter optimization enables effective light splitting and convergence while maintaining a relatively simple single-prism-sheet structure, balancing performance enhancement with structural simplicity.
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 effectively increases display brightness in the left and right view areas while reducing the brightness of the central-interference area, thereby improving the image display effect by minimizing the central-interference and enhancing the overall double-vision display quality.
Implementation Method 1
the first prism is adapted for converging light incident from the non-parallel backlight source
Implementation Method 2
prism sheets other than the first prism sheet are adapted for splitting the converged light stage by stage and converging the split light in the left and right view areas
Implementation Method 3
the prism sheet is adapted for splitting light incident from the parallel backlight source and converging the split light into the left and/or right view areas
Data Source
AI summary
In the embodiments of the invention, a double-vision backlight module and a LCD device are provided. In the embodiments of the present invention, a light-splitting prism sheet is disposed between a diffuser plate and a LCD panel for splitting light. The prism sheet is arranged such that a side having prisms thereon of the prism sheet faces the LCD panel, and thereby splitting the light and enhancing the brightness, and eventually enhancing the brightness in both left and right view areas and at the same time reducing the brightness in the central-interference area, and thus improving the double-vision effect.