Backlight Unit Optical Sheet Thermal Deformation Control
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Solution Overview
Problem
The optical sheet in backlight units experiences non-uniform thermal expansion due to uneven heat emission from the light source, leading to deformation issues such as wrinkles, which affect the display quality.
Innovation Solution
Incorporating at least one sheet holder at the bottom part of the frame facing the optical sheet to prevent deformation by pressing and holding the optical sheet, thereby managing thermal expansion and maintaining uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light source emits light, then light is provided to the liquid crystal panel, but heat is incidentally emitted causing thermal expansion of the optical sheet
Solution Approach 1:
The patent extracts the harmful thermal effect from the light emission process by introducing a heat reflective film that separates the light transmission function from the heat management function. The film allows light to pass through while reflecting heat back to the light source, thereby extracting the unwanted thermal component from the optical path.
Solution Approach 2:
The heat reflective film acts as an intermediary element between the light source and the optical sheet. It mediates the interaction by selectively allowing light to pass through while blocking heat transmission, thus protecting the optical sheet from thermal expansion without interfering with the light emission function.
2Stability of the object's composition
If the frame is spaced a predetermined distance apart from the optical sheet to consider thermal expansion, then thermal expansion is accommodated, but non-uniform thermal expansion causes deformation and wrinkles of the optical sheet
Solution Approach 1:
The patent applies local quality by positioning the heat reflective film specifically at the bottom surface of the light source, directly opposite the optical sheet. This localized application ensures that heat is reflected precisely where it would cause thermal expansion, while maintaining uniform support across the entire optical sheet through the frame structure.
Solution Approach 2:
The patent converts the harmful heat that would cause non-uniform thermal expansion into a beneficial reflected path that returns heat to the light source. By redirecting the thermal energy back to its origin, the system prevents optical sheet deformation while maintaining the light emission function.
3Illumination intensity
If the optical sheet is held close to the light source for efficient light transmission, then light distribution is improved, but thermal-induced deformation occurs
Solution Approach 1:
The heat reflective film extracts the thermal component from the light transmission path, allowing the optical sheet to be positioned close to the light source for efficient light distribution while preventing thermal-induced deformation. The film separates the light and heat transmission functions.
Solution Approach 2:
The heat reflective film serves as an intermediary layer between the light source and optical sheet, enabling close positioning for efficient light coupling while blocking harmful thermal effects. This mediator maintains both light distribution efficiency and optical sheet stability.
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 sheet holder effectively prevents deformation of the optical sheet, enhancing the display quality by ensuring consistent light distribution and reducing thermal-induced distortions.
Implementation Method 1
The heat emitted from the light source causes a thermal expansion of the optical sheet adjacent to the light source
Implementation Method 2
at least one sheet holder disposed at a bottom part of the frame facing the optical sheet... pressing and holding the optical sheet
Data Source
AI summary
A backlight unit and liquid crystal display device comprising the backlight unit is disclosed. A backlight unit comprises a light source, an optical sheet where light from the light source is incident, a frame surrounding an edge portion of the optical sheet; and at least one sheet holder disposed at a bottom part of the frame facing the optical sheet.