Polygonal Light Guide Plate for Thin LCD Bezel Reduction
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Solution Overview
Problem
The challenge in reducing the thickness and bezel size of liquid crystal display devices is limited by the size of the light guide plate, which is required to provide uniform luminance across the display area.
Innovation Solution
A liquid crystal display device design featuring a light guide plate with a polygonal shape and a reflective sheet, where the light source is positioned adjacent to one side, and the reflective sheet is used to redirect light to the display area, reducing the need for the light guide plate to cover the entire display area, thereby minimizing the device's thickness and bezel size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light guide plate is designed to cover the entire display area to provide uniform luminance, then the luminance uniformity is improved, but the device thickness and bezel size increase
Solution Approach 1:
The patent applies dimensionality change by extending the light guide plate beyond the display area boundaries in the planar dimension. The light guide plate covers not only the display area but also portions of the non-display area, allowing light to be guided from edge regions into the display area, thereby achieving uniform luminance while reducing the need for the plate to extend further in the thickness dimension
Solution Approach 2:
The patent uses the non-display area as an intermediary region. The light guide plate extends into the non-display area to serve as a light guiding pathway, where light from the edge light source travels through the non-display area portion of the plate and enters the display area, achieving uniform illumination without requiring the plate to directly cover the entire display area thickness
2Length of stationary object
If the light guide plate size is reduced to decrease device thickness, then the device thickness is improved, but the luminance uniformity deteriorates
Solution Approach 1:
The patent segments the light guide plate function into different spatial zones: a first portion extending into the non-display area that serves as the light guiding pathway, and a second portion covering the display area that provides light output. This segmentation allows the plate to be thinner overall while maintaining adequate light distribution through the strategically positioned first portion
3Area of stationary object
If the bezel size is reduced to improve device compactness, then the device compactness is improved, but the light distribution capability deteriorates
Solution Approach 1:
The patent applies local quality by concentrating the light guide plate's light guiding function in specific local regions - particularly in the non-display area portions adjacent to the light source. The plate is designed to extend into these specific bezel regions to capture and redirect light, while other areas can be minimized, achieving compact bezel size with maintained light distribution capability
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 design allows for a thinner and more compact liquid crystal display device by optimizing the light distribution and reducing the non-display area, while maintaining uniform luminance across the display panel.
Implementation Method 1
a light guide plate disposed under the liquid crystal display panel... The light emitted from the light source is incident on a side surface of the light guide plate and is emitted to an upper surface
Implementation Method 2
The light emitted from the light source is incident on a side surface of the light guide plate and is emitted to an upper surface and then reaches a liquid crystal display panel
Data Source
AI summary
Disclosed herein is a liquid crystal display device having a thin thickness and a reduced size of a bezel. According to an exemplary embodiment, the liquid crystal display device includes: a liquid crystal display panel including a display area and a non-display area enclosing the display area; a light guide plate disposed under the liquid crystal display panel and having a polygonal plane shape including a first side, a second side, a third side, and a fourth side; and a light source adjacent to the first side of the light guide plate, wherein at least one of the second side, the third side, and the fourth side of the light guide plate overlaps the display area.