LCD Illumination Device Edge Light Control
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Solution Overview
Problem
In liquid crystal display devices, narrowing the frame while maintaining effective illumination is challenging due to abnormal light emission from the edges of the light guide, which leads to brightly illuminated frame peripheral portions, affecting display quality.
Innovation Solution
The illumination device incorporates a light guide with at least one side surface inside the display area and an optical sheet with a transmittance adjustment area in its edge portion, reducing light transmission and minimizing abnormal light emission by using a dot pattern or solid print layer to control light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the light guide size is reduced to narrow the frame, then the frame width is reduced, but abnormal light emission occurs from the light guide edge causing non-uniform luminance in the display area
Solution Approach 1:
The patent applies local quality by providing a light-shielding layer at specific locations where abnormal light emission occurs (edge portions of the light guide). This light-shielding layer is not uniformly distributed but strategically placed only in areas where frame narrowing causes light leakage, thereby maintaining luminance uniformity without compromising the overall light guide functionality or requiring a larger frame.
Solution Approach 2:
The light-shielding layer acts as an intermediary element between the light guide and the display area. It intercepts and blocks the abnormal light emitted from the light guide edge before it reaches the display area, thus mediating the harmful effect of frame narrowing and preventing luminance non-uniformity without requiring changes to the light guide or frame structure themselves.
2Length of stationary object
If the light guide size is reduced to narrow the frame, then the frame width is reduced, but the edge of the light guide becomes abnormally luminous affecting display quality
Solution Approach 1:
The patent applies local quality by providing a light-shielding layer at specific locations where abnormal light emission occurs (edge portions of the light guide). This light-shielding layer is not uniformly distributed but strategically placed only in areas where frame narrowing causes light leakage, thereby maintaining luminance uniformity without compromising the overall light guide functionality or requiring a larger frame.
Solution Approach 2:
The light-shielding layer acts as an intermediary element between the light guide and the display area. It intercepts and blocks the abnormal light emitted from the light guide edge before it reaches the display area, thus mediating the harmful effect of frame narrowing and preventing luminance non-uniformity without requiring changes to the light guide or frame structure themselves.
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 allows for a narrower frame design while preventing abnormal light emission, thereby enhancing the display quality by ensuring uniform luminance across the display area.
Implementation Method 1
an optical sheet provided on an emission surface of the light guide and opposed to the display area. The optical sheet includes an edge portion which covers an area between the one side surface and an edge of the display area, and a transmittance adjustment area which is provided in the edge portion and reduces a transmittance of the edge portion
Data Source
AI summary
According to one embodiment, an illumination device includes a light guide, a light source device and an optical sheet. The light guide has an emission surface and side surfaces which intersect the emission surface, and at least one side surface is located inside a display area. The light source device emits light to the light guide. The optical sheet is provided on the emission surface and is opposed to the display area. The optical sheet has an edge portion which covers an area between the one side surface and an edge of the display area, and a transmittance adjustment area which is provided in the edge portion and reduces a transmittance of the edge portion.