Backlight Assembly Light Guide Panel Corner Segmentation
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Solution Overview
Problem
The edge-lighting type backlight assembly in liquid crystal displays (LCDs) faces issues with thermal deformation of the light guide panel and overlapping lights from LEDs, leading to non-uniform brightness and increased temperature at corners, which can damage the panel and affect display quality.
Innovation Solution
The design incorporates a light guide panel with stepped portions at corners to minimize light overlap and thermal deformation, featuring cut parts and supporting parts that connect with a lower cover to manage heat and maintain uniform light distribution, using LEDs arranged along lateral sides and a reflection sheet to reduce light loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If LEDs are arranged on both sides of the light guide panel to achieve slim form factor, then the backlight assembly thickness is reduced, but light overlap occurs at corners causing non-uniform brightness and increased temperature
Solution Approach 1:
The light guide panel is segmented at its corners by forming stepped portions that divide the corner regions from the main body. This segmentation prevents light from both sides from overlapping at the corners, thereby maintaining uniform brightness distribution across the panel while preserving the slim form factor achieved through dual-side LED arrangement.
Solution Approach 2:
The corner regions of the light guide panel are given different structural properties than the main body through the stepped portions. These localized structural modifications at the corners prevent light overlap specifically in those regions, addressing the brightness uniformity issue without affecting the overall slim design of the backlight assembly.
2Volume of moving object
If LEDs are arranged on both sides of the light guide panel to achieve slim form factor, then the backlight assembly thickness is reduced, but temperature increases at corners due to light overlap
Solution Approach 1:
The light guide panel is segmented at its corners by forming stepped portions that divide the corner regions from the main body. This segmentation prevents light from both sides from overlapping at the corners, thereby maintaining uniform brightness distribution across the panel while preserving the slim form factor achieved through dual-side LED arrangement.
Solution Approach 2:
The stepped portions at the corners serve to redirect the potentially harmful overlapping light away from the corner regions. By structurally guiding the light paths, the design converts what would be a harmful concentration of light energy into beneficial separate light distributions, reducing temperature increase at the corners while maintaining the slim profile.
3Area of stationary object
If the light guide panel is made longer to accommodate light source units, then light coverage is improved, but thermal deformation increases
Solution Approach 1:
The light guide panel is divided into a main body and separate corner regions through stepped portions. This segmentation allows the panel to maintain a larger overall area for adequate light coverage while the stepped structures at corners provide structural stability that resists thermal deformation, effectively decoupling the area expansion from thermal instability.
Solution Approach 2:
The stepped portions create an asymmetric structure at the corners of the light guide panel. This asymmetric design provides enhanced structural rigidity at the corners where thermal stress concentrates, allowing the panel to accommodate a larger area for light coverage while maintaining resistance to thermal deformation through the reinforced corner geometry.
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 effectively prevents light overlap and thermal deformation, ensuring uniform brightness and minimizing damage to the light guide panel, thereby enhancing the display's reliability and performance.
Implementation Method 1
a light guide panel having lateral sides, and a plurality of light source units each emitting light to at least two neighboring lateral sides of the light guide panel
Implementation Method 2
a plurality of light source units each emitting light to at least two neighboring lateral sides of the light guide panel
Data Source
AI summary
Disclosed herein are a backlight assembly and a liquid crystal display (LCD) having the same, wherein the backlight assembly includes a light guide panel having a plurality of lateral sides; and a plurality of light source units each emitting light to a respective lateral side of the plurality of lateral sides, wherein at least two lateral sides of the plurality of lateral sides, which receive light emitted from two respective light source units of the plurality of light source units, are neighboring lateral sides, and wherein at least one lateral side is longer than an incident surface which receives light emitted from the light source unit.