Matrix Backlight Unit Light Guide Plate Thickness Reduction
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Solution Overview
Problem
Conventional backlight units for LCD displays are thick due to the spacing required for optical members to improve light diffusion, which increases the overall thickness and affects the design and functionality of the display apparatus.
Innovation Solution
A backlight unit with light-emitting blocks arranged in a matrix shape, each comprising a light source unit and a light guiding unit, where the light source units are positioned to minimize thickness and include a transmit-reflecting sheet to optimize light transmission and reflection, allowing for reduced thickness without compromising luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the optical member is spaced apart from the lamps to improve light diffusion, then the light diffusion is improved, but the thickness of the backlight unit increases
Solution Approach 1:
The patent merges the optical member with the light guide plate by forming the light-diffusing pattern directly on the lower surface of the light guide plate. This integration eliminates the need for separate optical members and their spacing, thereby reducing backlight unit thickness while maintaining effective light diffusion through the integrated diffusing structures.
Solution Approach 2:
The patent uses a thin light guide plate with light-diffusing patterns formed on its surface to replace traditional bulky optical members. The light guide plate acts as a thin film structure that combines light transmission and diffusion functions, reducing the overall thickness while achieving the required light diffusion effect.
2Illumination intensity
If the optical member is spaced apart from the lamps, then the optical characteristics are improved, but the overall device size increases
Solution Approach 1:
The patent combines multiple optical functions (light guidance, diffusion, and uniformity improvement) into a single integrated light guide plate structure. This merging eliminates the need for separate optical members and their associated spacing, thereby reducing the backlight unit volume while maintaining or improving optical characteristics.
Solution Approach 2:
The light guide plate is designed to perform multiple functions simultaneously: guiding light from the edge, diffusing light through surface patterns, and improving luminance uniformity. This multi-functionality eliminates the need for separate dedicated optical members, reducing overall device volume.
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 solution reduces the thickness of the backlight unit while maintaining or improving light distribution and image quality, enabling more compact and efficient display designs with reduced power consumption and enhanced contrast ratio.
Implementation Method 1
a light-emitting chip to emit light
Implementation Method 2
a light guiding unit to guide the light
Implementation Method 3
a transmit-reflecting sheet disposed between the upper extending portion and the first light source unit to transmit the first light
Data Source
AI summary
An exemplary embodiment of the present invention discloses a backlight unit having a plurality of light-emitting blocks and a light source driving section. The plurality of light-emitting blocks is arranged in a matrix shape along first and second directions different from each other. Each of the light-emitting blocks includes a light source unit having at least one light-emitting chip to emit light, and a light guiding unit to guide the light. The light source driving section controls the light source unit of the light-emitting blocks to drive the light source unit.