Anisotropic Light Diffusion Layer for Backlight Brightness Uniformity
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Solution Overview
Problem
Display devices with liquid crystal panels and backlights suffer from non-uniform brightness due to the arrangement of light sources, leading to degradation in display quality and increased power consumption.
Innovation Solution
The implementation of a display device with a light diffusion layer having different diffusion degrees in orthogonal directions between light guides, which are arranged to equalize brightness distribution by controlling the diffusion of light emitted from adjacent light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light sources are arranged in a backlight to illuminate a liquid crystal display panel, then the display device can be implemented with a liquid crystal panel and backlight structure, but non-uniform brightness occurs due to the arrangement of light sources
Solution Approach 1:
The light diffusion layer is designed with spatially varying diffusion properties, having a first diffusion degree in a first direction and a second diffusion degree in a second direction. This anisotropic diffusion characteristic allows different regions and directions to have optimized light diffusion, compensating for the non-uniformity caused by discrete light source arrangement while maintaining the overall backlight structure.
2Ease of operation
If light sources are arranged to illuminate the display panel, then the display device can function, but power consumption increases
Solution Approach 1:
The patent optimizes the diffusion parameters of the light diffusion layer by controlling the size, shape, and distribution of diffusion particles or structures within the layer. By adjusting these parameters, the light from each light source is more effectively distributed across the display panel, reducing the need for excessive light output from individual sources and thereby lowering overall power consumption while maintaining display functionality.
3Ease of operation
If light sources are arranged to illuminate the display panel, then the display device can function, but heat generation increases
Solution Approach 1:
By optimizing the light diffusion parameters in the diffusion layer, the patent improves light utilization efficiency. This means that less energy is wasted as heat from inefficient light distribution, and the anisotropic diffusion helps distribute thermal load more evenly across the backlight structure, reducing localized heat generation while maintaining display operation.
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 solution effectively suppresses non-uniform brightness and improves display quality by ensuring consistent illumination across the display panel, reducing power consumption and heat generation.
Implementation Method 1
a light diffusion layer disposed between the display panel and each of the first light guide and the second light guide, the light diffusion layer exhibiting a first diffusion degree in a first direction along which the first light guide and the second light guide are arranged, which is higher than a second diffusion degree in a second direction crossing the first direction
Data Source
AI summary
A display device is provided and includes display panel; and illumination device opposed to display panel, illumination device including first light guide, second light guide arranged adjacent to first light guide in first direction, third light guide arranged adjacent to first light guide in second direction intersecting first direction, and fourth light guide arranged adjacent to second light guide in the second direction, light diffusion layer disposed between display panel and each of the first, second, third, and fourth light guides, wherein light diffusion layer exhibit first diffusion degree in first direction and second diffusion degree in second direction, second diffusion degree is different from the first diffusion degree, illumination device includes first ridge between first and second light guides and second ridge between first and third light guides, and under light diffusion layer, first brightness in first ridge is different from second brightness in second ridge.