LED Backlight Diffusion Plate with Inclined Depression Structures
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Solution Overview
Problem
Backlight modules using light emitting diodes (LEDs) suffer from non-uniform light distribution, leading to line-mura issues, which can be mitigated by increasing the number of LEDs and reducing their spacing, but this increases costs and complexity.
Innovation Solution
A diffusion plate with depression structures having inclined surfaces is positioned over the LEDs to refract light, reducing light loss and improving uniformity without increasing manufacturing costs by allowing light to be diffused and directed uniformly onto a display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of light emitting diodes is increased and spacing is reduced to reduce line-mura, then light uniformity is improved, but manufacturing cost increases
Solution Approach 1:
A diffusion plate with depression structures is introduced as an intermediary component between the LEDs and the display panel. The depression structures refract and diffuse light from each LED, creating uniform light distribution without requiring increased LED density. This mediator resolves the contradiction by achieving light uniformity through optical manipulation rather than increasing component quantity.
Solution Approach 2:
The invention changes the geometric parameters of the diffusion plate by creating depression structures with specific inclined surfaces. These structural parameter changes enable light refraction and diffusion, achieving uniform illumination while maintaining the original LED spacing and quantity, thus avoiding increased manufacturing costs.
2Illumination intensity
If multiple reflections occur in the light guide plate before light enters the display panel, then light distribution is improved, but brightness is reduced
Solution Approach 1:
The invention extracts the light diffusion function from the light guide plate by implementing depression structures directly on the diffusion plate. This eliminates the need for multiple internal reflections in the light guide plate, reducing energy loss while achieving uniform light distribution. The diffusion function is taken out and performed more efficiently at an earlier stage in the optical path.
3Illumination intensity
If the distance between light emitting diodes is decreased to reduce line-mura, then light uniformity is improved, but device volume is reduced
Solution Approach 1:
The diffusion plate with depression structures serves as a mediator that enables uniform light distribution without requiring decreased LED spacing. By introducing this optical intermediary, the system achieves light uniformity while maintaining adequate LED spacing, thereby avoiding unnecessary reduction in device volume.
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 reduces line-mura, decreases the volume of the display device, and maintains low manufacturing costs by enhancing light uniformity and reducing brightness loss, thereby improving display quality.
Implementation Method 1
Each depression structure is positioned over the corresponding light emitting diode and has an inclined surface. An inclined angle is formed between each inclined surface and a central axis of the corresponding light emitting diode for refracting light emitted by the corresponding light emitting diode.
Data Source
AI summary
A diffusion plate of a backlight structure and a display device using the same are provided. The diffusion plate is used in the backlight structure having several light emitting diodes. The diffusion plate includes a main body with many depression structures positioned on a surface of the main body. The surface faces the light emitting diodes. Each depression structure is positioned above the corresponding light emitting diode and includes an inclined surface. An inclined angle is formed between each inclined surface and a central axis of the corresponding light emitting diode for refracting the light emitted by the corresponding light emitting diode.