Backlight Unit Catching Part for Slim LCD Light Leakage
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Solution Overview
Problem
In LCD devices, particularly the slim type, light leakage and bounce occur due to gaps between the optical sheet and the guide panel, degrading image quality, as there is no effective structure to prevent these issues in existing designs.
Innovation Solution
A backlight unit is designed with a light guide panel, a light source, an optical sheet, a guide panel separated from the optical sheet, a reflector, and a cover bottom, where a catching part light absorbing material is coated on the optical sheet, the side reflector is cut, or a reflector light absorbing material is applied to prevent light leakage and bounce.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the guide panel is separated from the optical sheet to enable slim structure, then the device thickness is reduced, but light leakage and bounce occur through the gap between them
Solution Approach 1:
A catching part structure is introduced as an intermediary element between the guide panel and optical sheet. This catching part protrudes from the guide panel and engages with the optical sheet, serving as a mediator that prevents light from leaking through the gap while maintaining the slim separated structure. The catching part acts as a physical barrier that blocks the harmful light paths without requiring the panels to be in direct contact.
Solution Approach 2:
The gap between the separated guide panel and optical sheet, which initially causes light leakage, is converted into a beneficial feature by introducing the catching part. The catching part utilizes the existing gap space to create an effective light-blocking structure, transforming the harmful gap into a functional element that prevents light leakage while maintaining the slim profile.
2Object-affected harmful factors
If the guide panel covers the end of the optical sheet to prevent light leakage, then light leakage is prevented, but the device structure becomes more complex and thicker
Solution Approach 1:
The guide panel is segmented with a protruding catching part that selectively engages with the optical sheet only at specific locations where light leakage occurs. This segmentation allows the guide panel to prevent light leakage locally without requiring complete coverage, thereby reducing structural complexity and maintaining a slim profile while still effectively blocking light paths.
Solution Approach 2:
Instead of uniformly covering the entire optical sheet end, the catching part provides localized light blocking only at the critical gap region. This local quality approach applies the light-blocking function precisely where needed, reducing unnecessary structural elements and simplifying the overall device design while maintaining effectiveness.
3Object-affected harmful factors
If the guide panel covers the end of the optical sheet to prevent light leakage, then light leakage is prevented, but the device thickness increases
Solution Approach 1:
The catching part is designed as a dynamic engagement structure that protrudes from the guide panel and selectively engages with the optical sheet only when needed to block light paths. This dynamic approach allows the structure to maintain a slim profile in non-critical areas while providing light blocking only where necessary, optimizing the thickness-to-effectiveness ratio.
Solution Approach 2:
The light blocking function is achieved by extending the guide panel in a protruding dimension (the catching part) rather than increasing the overall device thickness uniformly. This dimensional change allows light leakage prevention at specific locations without increasing the overall device thickness, as the blocking structure extends laterally rather than adding to the thickness dimension.
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 effectively prevents light leakage and bounce, enhancing image quality and reducing manufacturing defects, thereby improving the overall performance of LCD devices.
Implementation Method 1
a catching part light absorbing material is coated on a catching part which is formed at the optical sheet
Implementation Method 2
a reflector disposed at a rear surface of the light guide panel to reflect the light, transferred through the light guide panel, toward the front surface of the light guide panel
Implementation Method 3
an optical sheet disposed at a front surface of the light guide panel to change a traveling direction of the light, transferred from the light guide panel, to a direction vertical to the light guide panel
Data Source
AI summary
Discussed are a backlight unit and an LCD device including the same. The backlight unit includes a light guide panel, a light source part disposed at a side of the light guide panel to emit the light, an optical sheet disposed at a front surface of the light guide panel to change a traveling direction of the light to a direction vertical to the light guide panel, a guide panel separated from an end of the optical sheet, and configured to guide the light guide panel, the light source part, and the optical sheet, a reflector disposed at a rear surface of the light guide panel to reflect the light toward the front surface of the light guide panel, a side reflector adhered to a side of the light guide panel, and a cover bottom coupled to the guide panel and in which the reflector is disposed.