Back Light Module Mount for LCD Illumination Uniformity
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Solution Overview
Problem
Large LCDs face issues with uneven back light distribution due to heat-induced deformation of light guiding plates and bending of optical film sheets when using edge-lit LEDs, especially when mounted vertically, leading to reduced illumination quality.
Innovation Solution
A back light module design that maintains a predetermined interval between the light bar and light guiding plate using a mount with a limiting structure, and an optical film sheet held by a second holding structure, preventing deformation and ensuring the film remains flat even when the module is used vertically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light guiding plate is disposed closer to the light bar to improve light entry efficiency, then the illumination intensity is improved, but the light guiding plate is deformed or damaged due to heat impact
Solution Approach 1:
A mount structure is introduced as an intermediary component between the light bar and light guiding plate. The mount includes a limiting structure that constrains the stop structure of the light guiding plate, maintaining a predetermined interval that prevents direct contact while allowing efficient light entry. This mediator resolves the contradiction by enabling close proximity for light efficiency while preventing heat-induced damage through controlled separation.
2Ease of manufacture
If the optical film sheet is made thinner to reduce material cost, then the manufacturing cost is reduced, but the optical film sheet bends due to incapability of supporting its weight when used vertically
Solution Approach 1:
The mount structure serves as a supporting intermediary for the optical film sheet. The first holding structure of the mount engages with the second holding structure of the optical film sheet, providing mechanical support that enables the use of thinner, more cost-effective film materials while preventing bending and maintaining flatness during vertical operation.
Solution Approach 2:
The solution transitions from relying solely on the film's intrinsic mechanical properties (two-dimensional strength) to introducing a third-dimensional support structure (the mount) that provides dimensional stability. This allows thinner films to maintain structural integrity through external geometric support rather than increased material thickness.
3Illumination intensity
If the light guiding plate is disposed closer to the light bar to improve light entry efficiency, then the illumination intensity is improved, but the back light distribution becomes uneven due to heat-induced deformation
Solution Approach 1:
The mount structure with its limiting and holding structures acts as a precision intermediary that maintains a predetermined interval between the light bar and light guiding plate. This controlled separation prevents heat-induced deformation while ensuring optimal light entry, thereby achieving both high illumination intensity and uniform back light distribution simultaneously.
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 design maintains uniform back light distribution and prevents damage to the light guiding plate, ensuring consistent illumination and image quality across different orientations.
Implementation Method 1
edge-lit LEDs to provide back light... light emitted by the lighting units can enter the light guiding plate... light incident side surface extends in the extension direction and is disposed corresponding to the light bar, for example but not limited to being right opposite to the light bar
Data Source
AI summary
A displaying apparatus includes a back light module and a panel module. The back light module is joined with the panel module and includes a mount, a light bar, a light guiding plate, and an optical film sheet. The mount includes a limiting structure and a holding structure. The light bar is fixed on the mount. The light guiding plate is disposed adjacent to the mount. The limiting structure constrains a stop structure so that a light incident side surface of the light guiding plate and the light bar remain separated at a predetermined interval. The optical film sheet includes a holding structure and is disposed above alight emitting surface of the light guiding plate. The two holding structures are engaged. Thereby, the mount performs limitation to both of the light guiding plate and the optical film sheet.