Edge Light Scattering Patterns for LCD Hot Spot Prevention
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Solution Overview
Problem
LCD devices with edge-type LED backlight units experience a hot spot phenomenon and reduced brightness at edge regions due to weak light distribution, leading to dark semi-circular areas and degraded appearance quality.
Innovation Solution
A liquid crystal display device with a light guide plate featuring light scattering patterns at its edge regions, where light emitting devices are positioned between these patterns to enhance light distribution and prevent hot spots, using a reflection plate and optical sheets to maintain uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If edge-type LED backlight unit is used, then device complexity is reduced and manufacturing is easier, but brightness and uniformity at edge regions deteriorate due to weak light distribution
Solution Approach 1:
The light guide plate incorporates light scattering patterns specifically at the edge regions where light distribution is weak, while maintaining a smooth surface in the central region. This localized modification ensures that light scattering is applied only where needed to enhance brightness and uniformity at the edges without affecting the overall optical performance of the display device.
2Area of stationary object
If light guide system extends to comparatively far distance from light source, then coverage area is improved, but light transmission loss increases
Solution Approach 1:
The light scattering patterns are pre-formed on the light guide plate at positions corresponding to the edge regions where light distribution is weak. This preliminary action ensures that light is scattered and redistributed before it reaches the far distance from the light source, preventing light transmission loss and maintaining uniform brightness across the entire display area.
3Illumination intensity
If light scattering patterns are added to light guide plate, then brightness uniformity is improved, but device complexity increases
Solution Approach 1:
The light scattering patterns are implemented only at the edge regions of the light guide plate where brightness uniformity is compromised, rather than across the entire surface. This localized approach enhances brightness uniformity at the edges while minimizing the increase in device complexity by avoiding unnecessary modifications in the central region.
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 light scattering patterns on the light guide plate ensure consistent brightness across the LCD screen, preventing dark areas and enhancing the appearance quality by optimizing light refraction and reflection.
Implementation Method 1
optimizing light refraction and reflection
Implementation Method 2
light scattering patterns formed in a plurality of groups at one or more edge regions on an upper surface
Implementation Method 3
using a reflection plate and optical sheets to maintain uniform brightness
Data Source
AI summary
Disclosed is a liquid crystal display (LCD) device having light scattering patterns at an edge region of a light guide plate, capable of preventing a hot spot phenomenon occurring when an edge-type backlight unit is implemented with using light emitting means such as light emitting diodes (LED). The LCD device comprises: an LC panel; a light guide plate disposed below the LC panel, and having light scattering patterns formed in a plurality of groups with a constant gap therebetween at one or more edge regions on an upper surface thereof; and light emitting devices disposed at a side wall of the light guide plate, each light emitting device disposed to correspond to a region between the light scattering patterns, for emitting light.