Backlight Module Light-Adjusting Layer Small Viewing Angle Contrast
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Solution Overview
Problem
Current backlight modules, particularly the direct-down type, face challenges in achieving sufficient contrast at small viewing angles due to the large deflection angle of light by the prism, resulting in inadequate brightness and contrast in these areas.
Innovation Solution
A backlight module design incorporating a light-adjusting layer with specific surface configurations, including a first surface and a second surface with sub-surfaces inclined away from the light-exiting surface, which deflects light in multiple directions to enhance luminous flux at small viewing angles, thereby improving contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a prism is used to concentrate dispersed light, then brightness in a certain angle range is improved, but contrast in small viewing angle areas deteriorates due to large deflection angle
Solution Approach 1:
The optical film is segmented into multiple functional layers: a lower diffuser layer, a prism layer, and an upper diffuser layer. Each layer performs a specific function in light modulation, allowing precise control over light distribution to achieve both brightness enhancement and contrast improvement in different viewing angle regions.
Solution Approach 2:
Different regions of the optical film have different optical properties. The prism layer is designed with specific refraction angles to concentrate light in certain directions, while the upper diffuser layer has different diffusion characteristics to control light distribution in viewing angle directions, achieving local optimization of both brightness and contrast.
2Illumination intensity
If a direct-down type backlight source is used to provide sufficient brightness, then illumination intensity is improved, but device complexity increases due to the large number of illuminants required
Solution Approach 1:
Multiple light-emitting elements are merged into a single integrated direct-down type backlight source. This unified structure provides sufficient brightness across the entire display surface while simplifying the overall device architecture and reducing the number of separate illuminant components needed.
Solution Approach 2:
The direct-down type backlight source serves multiple functions simultaneously: it provides uniform illumination across the display surface, works effectively with the optical film layers for light diffusion and concentration, and maintains compatibility with the liquid crystal panel's viewing angle requirements, making it a multi-functional lighting solution.
3Illumination intensity
If a side-entry type backlight source is used with light guide plate and reflective structures, then light distribution is improved, but device complexity increases
Solution Approach 1:
The invention extracts and eliminates the complex light guide plate and reflective structure components from the side-entry type backlight design. By removing these additional elements, the device complexity is reduced while the direct-down type backlight source directly provides the required light distribution to the optical film layers.
Solution Approach 2:
Instead of using side-entry illumination with light guide plates that redirect light through complex reflective structures, the invention inverts the approach by using direct-down type illumination where light sources are positioned directly behind the display surface, eliminating the need for light guiding and reflection mechanisms.
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 design effectively increases contrast in small viewing angle areas by redistributing light flux, meeting the required contrast ratio of 1300 and simplifying manufacturing by replacing the complex prism structure with a single light-adjusting layer.
Implementation Method 1
The function of the prism is to use the law of total reflection and refraction to concentrate the dispersed light in a certain angle range and emit it
Implementation Method 2
The function of the prism is to use the law of total reflection and refraction to concentrate the dispersed light in a certain angle range and emit it
Implementation Method 3
a light-adjusting layer located on a side of the optical film adjacent to the light-exiting surface of the backlight module. The light-adjusting layer includes a plurality of light-adjusting units, a light-adjusting unit of the plurality of light-adjusting unit includes a first surface and a second surface oppositely arranged along the first direction
Data Source
AI summary
A backlight module and a display device are provided. The backlight module includes a lighting-emitting unit; an optical film; and a light-adjusting layer located on a side of the optical film adjacent to the light-exiting surface of the backlight module. The light-adjusting layer includes light-adjusting units, a light-adjusting unit includes a first surface and a second surface, the first surface is located on a side of the second surface adjacent to the light-exiting surface and is a flat surface, the second surface at least includes a first sub-surface and a second sub-surface, along a second direction, a plane where the first sub-surface is located intersects a plane where the first surface is located, the first sub-surface and the second sub-surface are inclined to a side away from the light-exiting surface, and the first direction, the second direction and the third direction all intersect each other.