Backlight Module Tapered Optical Structures for Uniform Light Distribution
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Solution Overview
Problem
Conventional direct-light-type backlight modules exhibit uneven light mixing and contrasting bright and dark areas due to the packaging structure of light-emitting diodes, resulting in suboptimal optical appearance and luminance.
Innovation Solution
The light source structure includes light-emitting units with central optical axes vertically aligned to a substrate, shifted relative to their packaging structures, and an optical film with tapered structures that refract and reflect light to distribute it uniformly, increasing side emission and reducing contrast between bright and dark areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light-emitting diodes are packaged in conventional package bodies with light-emitting chips positioned in the middle, then the structure is simple and easy to manufacture, but light is mainly emitted from the top of the package body resulting in high intensity top emission and weak side emission which causes dark areas between adjacent light-emitting bodies
Solution Approach 1:
The patent applies asymmetry by positioning the light-emitting chip off-center within the package body, specifically at one end rather than in the middle. This asymmetric positioning causes light to be emitted preferentially from the side of the package body rather than mainly from the top, thereby increasing side emission intensity and reducing the dark areas between adjacent light-emitting bodies while maintaining manufacturing simplicity
2Power
If light-emitting diodes are arranged in array on back plate, then the backlight module can provide sufficient luminance, but dark areas form between adjacent light-emitting bodies causing obvious contrasting appearance and uneven light mixing
Solution Approach 1:
The patent applies asymmetry by positioning light-emitting chips at one end of package bodies rather than in the center, which changes the light emission pattern from primarily top-directed to primarily side-directed. This asymmetric configuration allows light to spread more uniformly across the backlight module, reducing the formation of dark areas between adjacent light-emitting bodies and improving overall light uniformity while maintaining sufficient luminance
Solution Approach 2:
The patent applies local quality by creating regions with different light emission characteristics - the asymmetric chip positioning creates localized areas of enhanced side emission that compensate for the dark zones between adjacent light-emitting bodies, thereby achieving more uniform overall light distribution across the backlight module surface
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 enhances light mixing, increases brightness in dark areas, and improves overall luminance by directing light to travel along different paths, resulting in a more uniform and aesthetically pleasing optical output.
Implementation Method 1
an optical film with tapered structures that refract and reflect light to distribute it uniformly
Implementation Method 2
an optical film with tapered structures that refract and reflect light to distribute it uniformly
Data Source
AI summary
A backlight module and a display device are provided. The backlight module includes a light source structure and at least one optical film. The optical film is disposed above the light source structure. The optical film includes a main body and plural optical structures. The optical structures are disposed on the main body. Each of the optical structures is a tapered structure. Each of the optical structures has plural side surfaces, and a portion of light emitted from the light source structure is guided toward plural primary directions when passing through the side surfaces of the optical structures, and therefore the light emitted from the light source is no longer concentrated on the top of each of the optical structures.