Display Device Light Refraction Portion Bright Spot Reduction
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Solution Overview
Problem
Conventional liquid crystal display devices suffer from inferior light utilization efficiency, leading to compromised display quality and visibility issues due to bright spots and black spots caused by foreign substances.
Innovation Solution
Incorporating a light refraction portion, such as a Fresnel lens sheet, and a low refraction index layer between the liquid crystal panel and the optical member, which imparts an anisotropic refraction effect to the light, ensuring it is oriented towards the center of the display surface, while the low refraction index layer spreads light in a wide-angle manner to minimize the impact of foreign substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light diffusion member is arranged between the spacer and the liquid crystal display panel to improve visibility, then visibility failure caused by bright spots is improved, but light utilization efficiency deteriorates
Solution Approach 1:
The patent introduces a low refraction index layer as an intermediary substance between the optical member and the liquid crystal display panel. This layer has a refraction index lower than both the optical member and the panel, creating a gradient refraction index structure that reduces the refraction effect at the interface. This intermediary layer effectively suppresses bright spots and improves visibility without the need for light diffusion members that would scatter and waste light, thereby maintaining high light utilization efficiency.
2Loss of energy
If an anisotropic refraction effect is imparted to light from the end side of the light emission surface to orient it toward the center, then light utilization efficiency is improved, but display quality deteriorates due to visible foreign substances causing bright and black spots
Solution Approach 1:
The patent changes the refraction index parameter by introducing a low refraction index layer with a refraction index lower than the optical member. This parameter change creates a refraction index gradient that reduces the strength of the anisotropic refraction effect at the interface between the optical member and the display panel. As a result, light from foreign substances is less strongly refracted, making bright and black spots less visible, while still maintaining adequate light utilization efficiency through the anisotropic refraction in the optical member itself.
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 display quality by effectively utilizing light and reducing the visibility of bright spots and black spots, maintaining high light utilization efficiency and preventing deterioration of the display.
Implementation Method 1
The optical member includes a light refraction portion that imparts an anisotropic refraction effect to at least the light emitted from an end side of the light emission surface
Implementation Method 2
the refraction effect is imparted to the light emitted from the light emission surface of the optical member to be spread toward the end side of the display surface, by the low refraction index layer interposed between the optical member and the display panel
Data Source
AI summary
A display device includes a display panel having a display surface and a lighting device that supplies light to the display panel. The lighting device includes a light source, and an optical member having at least a light exit surface through which the light emitted by the light source exits toward the display surface of the display panel. The optical member includes a light refraction portion that imparts an anisotropic refraction effect to at least light rays exiting through an edge section of the light exit surface to be oriented toward a center side of the display surface. The display device further includes a low refraction index layer interposed between the display panel and the optical member, and the low refraction index layer has a refraction index lower than at least a refraction index of the optical member.