Backlight Module with Angular Deflection Film for Off-Center Brightness
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Solution Overview
Problem
The issue of low light efficiency utilization rate in VR LCD backlight modules due to concentrated light emission towards the surface normal, resulting in low brightness at the off-center field of view.
Innovation Solution
A backlight module with an angular deflection film featuring annular light modulation portions that sequentially increase the acute included angle between the light modulation surface and the light incident surface, enhancing light deflection and brightness at the edge regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light emitted from the backlight module is concentrated in the direction toward the surface normal, then the brightness at the center field of view is improved, but the brightness at the off-center field of view becomes low, resulting in low light efficiency utilization rate
Solution Approach 1:
The angular deflection film divides the backlight into multiple annular light modulation portions, each responsible for deflecting light in specific angular ranges. This segmentation allows different regions of the backlight to be directed toward different viewing angles, improving both center and off-center brightness while increasing overall light efficiency utilization.
Solution Approach 2:
Different annular light modulation portions have different deflection characteristics tailored to their specific positions. The light modulation surfaces are designed with varying angles and orientations to locally optimize light distribution for their respective angular zones, ensuring that each region contributes effectively to the overall light efficiency.
2Measurement precision
If the resolution of the VR LCD panel is increased to achieve ultra-high-resolution screen, then the picture quality is improved, but the transmittance of the liquid crystal panel decreases, resulting in low brightness
Solution Approach 1:
The angular deflection film performs preliminary light distribution optimization before light reaches the LCD panel. By pre-deflecting light into appropriate angular ranges, the system compensates for the reduced transmittance of high-resolution panels, ensuring sufficient brightness is delivered to the viewer despite the panel's lower light transmission efficiency.
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
Improves light efficiency utilization and brightness uniformity across the field of view by effectively deflecting light further away from the center, addressing the low brightness at off-center regions.
Implementation Method 1
an angular deflection film disposed on the light output side of the backlight... the light modulation surface and the light incident surface have a preset acute included angle... effectively deflecting light further away from the center
Data Source
AI summary
A backlight module and a display device are provided in the present application. In the backlight module, a light modulation surface of the annular light modulation portion is connected to an end of a corresponding light incident surface away from a physical center, and in a direction from the physical center to the annular light modulation portion, a degree of an acute angle between the light modulation surface and the light incident surface is sequentially increased; or, a light modulation surface corresponding to the annular light modulation portion is connected to an end of a corresponding light incident surface near the physical center, and in the direction from the physical center to the annular light modulation portion, the degree of the acute angle between the light modulation surface and the light incident surface is sequentially increased.